diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index b714204458..6a19d449f3 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -36,9 +36,9 @@ import (
 
 // Ethash proof-of-work protocol constants.
 var (
-	frontierBlockReward   *big.Int = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
-	metropolisBlockReward *big.Int = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Metropolis
-	maxUncles                      = 2                 // Maximum number of uncles allowed in a single block
+	frontierBlockReward  *big.Int = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
+	byzantiumBlockReward *big.Int = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
+	maxUncles                     = 2                 // Maximum number of uncles allowed in a single block
 )
 
 // Various error messages to mark blocks invalid. These should be private to
@@ -290,8 +290,8 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainReader, header, parent *
 func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int {
 	next := new(big.Int).Add(parent.Number, big1)
 	switch {
-	case config.IsMetropolis(next):
-		return calcDifficultyMetropolis(time, parent)
+	case config.IsByzantium(next):
+		return calcDifficultyByzantium(time, parent)
 	case config.IsHomestead(next):
 		return calcDifficultyHomestead(time, parent)
 	default:
@@ -310,10 +310,10 @@ var (
 	big2999999    = big.NewInt(2999999)
 )
 
-// calcDifficultyMetropolis is the difficulty adjustment algorithm. It returns
+// calcDifficultyByzantium is the difficulty adjustment algorithm. It returns
 // the difficulty that a new block should have when created at time given the
-// parent block's time and difficulty. The calculation uses the Metropolis rules.
-func calcDifficultyMetropolis(time uint64, parent *types.Header) *big.Int {
+// parent block's time and difficulty. The calculation uses the Byzantium rules.
+func calcDifficultyByzantium(time uint64, parent *types.Header) *big.Int {
 	// https://github.com/ethereum/EIPs/issues/100.
 	// algorithm:
 	// diff = (parent_diff +
@@ -530,8 +530,8 @@ var (
 func AccumulateRewards(config *params.ChainConfig, state *state.StateDB, header *types.Header, uncles []*types.Header) {
 	// Select the correct block reward based on chain progression
 	blockReward := frontierBlockReward
-	if config.IsMetropolis(header.Number) {
-		blockReward = metropolisBlockReward
+	if config.IsByzantium(header.Number) {
+		blockReward = byzantiumBlockReward
 	}
 	// Accumulate the rewards for the miner and any included uncles
 	reward := new(big.Int).Set(blockReward)
diff --git a/core/state_processor.go b/core/state_processor.go
index 4115eab8cb..689c83785f 100644
--- a/core/state_processor.go
+++ b/core/state_processor.go
@@ -105,7 +105,7 @@ func ApplyTransaction(config *params.ChainConfig, bc *BlockChain, author *common
 
 	// Update the state with pending changes
 	var root []byte
-	if config.IsMetropolis(header.Number) {
+	if config.IsByzantium(header.Number) {
 		statedb.Finalise(true)
 	} else {
 		root = statedb.IntermediateRoot(config.IsEIP158(header.Number)).Bytes()
diff --git a/core/types/receipt.go b/core/types/receipt.go
index 4f3b7357ed..e179fe0cfd 100644
--- a/core/types/receipt.go
+++ b/core/types/receipt.go
@@ -79,7 +79,7 @@ func NewReceipt(root []byte, failed bool, cumulativeGasUsed *big.Int) *Receipt {
 }
 
 // EncodeRLP implements rlp.Encoder, and flattens the consensus fields of a receipt
-// into an RLP stream. If no post state is present, metropolis fork is assumed.
+// into an RLP stream. If no post state is present, byzantium fork is assumed.
 func (r *Receipt) EncodeRLP(w io.Writer) error {
 	return rlp.Encode(w, &receiptRLP{r.statusEncoding(), r.CumulativeGasUsed, r.Bloom, r.Logs})
 }
diff --git a/core/vm/contracts.go b/core/vm/contracts.go
index 790d42bbe6..7344b6043c 100644
--- a/core/vm/contracts.go
+++ b/core/vm/contracts.go
@@ -46,9 +46,9 @@ var PrecompiledContractsHomestead = map[common.Address]PrecompiledContract{
 	common.BytesToAddress([]byte{4}): &dataCopy{},
 }
 
-// PrecompiledContractsMetropolis contains the default set of pre-compiled Ethereum
-// contracts used in the Metropolis release.
-var PrecompiledContractsMetropolis = map[common.Address]PrecompiledContract{
+// PrecompiledContractsByzantium contains the default set of pre-compiled Ethereum
+// contracts used in the Byzantium release.
+var PrecompiledContractsByzantium = map[common.Address]PrecompiledContract{
 	common.BytesToAddress([]byte{1}): &ecrecover{},
 	common.BytesToAddress([]byte{2}): &sha256hash{},
 	common.BytesToAddress([]byte{3}): &ripemd160hash{},
diff --git a/core/vm/contracts_test.go b/core/vm/contracts_test.go
index 880d7324ae..513651835a 100644
--- a/core/vm/contracts_test.go
+++ b/core/vm/contracts_test.go
@@ -321,7 +321,7 @@ var bn256PairingTests = []precompiledTest{
 }
 
 func testPrecompiled(addr string, test precompiledTest, t *testing.T) {
-	p := PrecompiledContractsMetropolis[common.HexToAddress(addr)]
+	p := PrecompiledContractsByzantium[common.HexToAddress(addr)]
 	in := common.Hex2Bytes(test.input)
 	contract := NewContract(AccountRef(common.HexToAddress("1337")),
 		nil, new(big.Int), p.RequiredGas(in))
@@ -338,7 +338,7 @@ func benchmarkPrecompiled(addr string, test precompiledTest, bench *testing.B) {
 	if test.noBenchmark {
 		return
 	}
-	p := PrecompiledContractsMetropolis[common.HexToAddress(addr)]
+	p := PrecompiledContractsByzantium[common.HexToAddress(addr)]
 	in := common.Hex2Bytes(test.input)
 	reqGas := p.RequiredGas(in)
 	contract := NewContract(AccountRef(common.HexToAddress("1337")),
diff --git a/core/vm/evm.go b/core/vm/evm.go
index 495d9beea1..b0a6f3d269 100644
--- a/core/vm/evm.go
+++ b/core/vm/evm.go
@@ -41,8 +41,8 @@ type (
 func run(evm *EVM, snapshot int, contract *Contract, input []byte) ([]byte, error) {
 	if contract.CodeAddr != nil {
 		precompiles := PrecompiledContractsHomestead
-		if evm.ChainConfig().IsMetropolis(evm.BlockNumber) {
-			precompiles = PrecompiledContractsMetropolis
+		if evm.ChainConfig().IsByzantium(evm.BlockNumber) {
+			precompiles = PrecompiledContractsByzantium
 		}
 		if p := precompiles[*contract.CodeAddr]; p != nil {
 			return RunPrecompiledContract(p, input, contract)
@@ -151,8 +151,8 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
 	)
 	if !evm.StateDB.Exist(addr) {
 		precompiles := PrecompiledContractsHomestead
-		if evm.ChainConfig().IsMetropolis(evm.BlockNumber) {
-			precompiles = PrecompiledContractsMetropolis
+		if evm.ChainConfig().IsByzantium(evm.BlockNumber) {
+			precompiles = PrecompiledContractsByzantium
 		}
 		if precompiles[addr] == nil && evm.ChainConfig().IsEIP158(evm.BlockNumber) && value.Sign() == 0 {
 			return nil, gas, nil
diff --git a/core/vm/gas_table.go b/core/vm/gas_table.go
index 13712295c9..0d8e295a52 100644
--- a/core/vm/gas_table.go
+++ b/core/vm/gas_table.go
@@ -324,7 +324,7 @@ func gasCall(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem
 		eip158         = evm.ChainConfig().IsEIP158(evm.BlockNumber)
 	)
 	if eip158 {
-		if transfersValue && evm.StateDB.Empty(address)  {
+		if transfersValue && evm.StateDB.Empty(address) {
 			gas += params.CallNewAccountGas
 		}
 	} else if !evm.StateDB.Exist(address) {
diff --git a/core/vm/interpreter.go b/core/vm/interpreter.go
index d3e24a7a45..b0d796a44b 100644
--- a/core/vm/interpreter.go
+++ b/core/vm/interpreter.go
@@ -70,8 +70,8 @@ func NewInterpreter(evm *EVM, cfg Config) *Interpreter {
 	// we'll set the default jump table.
 	if !cfg.JumpTable[STOP].valid {
 		switch {
-		case evm.ChainConfig().IsMetropolis(evm.BlockNumber):
-			cfg.JumpTable = metropolisInstructionSet
+		case evm.ChainConfig().IsByzantium(evm.BlockNumber):
+			cfg.JumpTable = byzantiumInstructionSet
 		case evm.ChainConfig().IsHomestead(evm.BlockNumber):
 			cfg.JumpTable = homesteadInstructionSet
 		default:
@@ -88,7 +88,7 @@ func NewInterpreter(evm *EVM, cfg Config) *Interpreter {
 }
 
 func (in *Interpreter) enforceRestrictions(op OpCode, operation operation, stack *Stack) error {
-	if in.evm.chainRules.IsMetropolis {
+	if in.evm.chainRules.IsByzantium {
 		if in.readOnly {
 			// If the interpreter is operating in readonly mode, make sure no
 			// state-modifying operation is performed. The 3rd stack item
diff --git a/core/vm/jump_table.go b/core/vm/jump_table.go
index f0a922912f..9ef192fdf9 100644
--- a/core/vm/jump_table.go
+++ b/core/vm/jump_table.go
@@ -51,14 +51,14 @@ type operation struct {
 }
 
 var (
-	frontierInstructionSet   = NewFrontierInstructionSet()
-	homesteadInstructionSet  = NewHomesteadInstructionSet()
-	metropolisInstructionSet = NewMetropolisInstructionSet()
+	frontierInstructionSet  = NewFrontierInstructionSet()
+	homesteadInstructionSet = NewHomesteadInstructionSet()
+	byzantiumInstructionSet = NewByzantiumInstructionSet()
 )
 
-// NewMetropolisInstructionSet returns the frontier, homestead and
-// metropolis instructions.
-func NewMetropolisInstructionSet() [256]operation {
+// NewByzantiumInstructionSet returns the frontier, homestead and
+// byzantium instructions.
+func NewByzantiumInstructionSet() [256]operation {
 	// instructions that can be executed during the homestead phase.
 	instructionSet := NewHomesteadInstructionSet()
 	instructionSet[STATICCALL] = operation{
diff --git a/params/config.go b/params/config.go
index f4bb6172ba..324620ad5c 100644
--- a/params/config.go
+++ b/params/config.go
@@ -32,45 +32,45 @@ var (
 var (
 	// MainnetChainConfig is the chain parameters to run a node on the main network.
 	MainnetChainConfig = &ChainConfig{
-		ChainId:         big.NewInt(1),
-		HomesteadBlock:  big.NewInt(1150000),
-		DAOForkBlock:    big.NewInt(1920000),
-		DAOForkSupport:  true,
-		EIP150Block:     big.NewInt(2463000),
-		EIP150Hash:      common.HexToHash("0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0"),
-		EIP155Block:     big.NewInt(2675000),
-		EIP158Block:     big.NewInt(2675000),
-		MetropolisBlock: big.NewInt(math.MaxInt64), // Don't enable yet
+		ChainId:        big.NewInt(1),
+		HomesteadBlock: big.NewInt(1150000),
+		DAOForkBlock:   big.NewInt(1920000),
+		DAOForkSupport: true,
+		EIP150Block:    big.NewInt(2463000),
+		EIP150Hash:     common.HexToHash("0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0"),
+		EIP155Block:    big.NewInt(2675000),
+		EIP158Block:    big.NewInt(2675000),
+		ByzantiumBlock: big.NewInt(math.MaxInt64), // Don't enable yet
 
 		Ethash: new(EthashConfig),
 	}
 
 	// TestnetChainConfig contains the chain parameters to run a node on the Ropsten test network.
 	TestnetChainConfig = &ChainConfig{
-		ChainId:         big.NewInt(3),
-		HomesteadBlock:  big.NewInt(0),
-		DAOForkBlock:    nil,
-		DAOForkSupport:  true,
-		EIP150Block:     big.NewInt(0),
-		EIP150Hash:      common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d"),
-		EIP155Block:     big.NewInt(10),
-		EIP158Block:     big.NewInt(10),
-		MetropolisBlock: big.NewInt(math.MaxInt64), // Don't enable yet
+		ChainId:        big.NewInt(3),
+		HomesteadBlock: big.NewInt(0),
+		DAOForkBlock:   nil,
+		DAOForkSupport: true,
+		EIP150Block:    big.NewInt(0),
+		EIP150Hash:     common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d"),
+		EIP155Block:    big.NewInt(10),
+		EIP158Block:    big.NewInt(10),
+		ByzantiumBlock: big.NewInt(math.MaxInt64), // Don't enable yet
 
 		Ethash: new(EthashConfig),
 	}
 
 	// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
 	RinkebyChainConfig = &ChainConfig{
-		ChainId:         big.NewInt(4),
-		HomesteadBlock:  big.NewInt(1),
-		DAOForkBlock:    nil,
-		DAOForkSupport:  true,
-		EIP150Block:     big.NewInt(2),
-		EIP150Hash:      common.HexToHash("0x9b095b36c15eaf13044373aef8ee0bd3a382a5abb92e402afa44b8249c3a90e9"),
-		EIP155Block:     big.NewInt(3),
-		EIP158Block:     big.NewInt(3),
-		MetropolisBlock: big.NewInt(math.MaxInt64), // Don't enable yet
+		ChainId:        big.NewInt(4),
+		HomesteadBlock: big.NewInt(1),
+		DAOForkBlock:   nil,
+		DAOForkSupport: true,
+		EIP150Block:    big.NewInt(2),
+		EIP150Hash:     common.HexToHash("0x9b095b36c15eaf13044373aef8ee0bd3a382a5abb92e402afa44b8249c3a90e9"),
+		EIP155Block:    big.NewInt(3),
+		EIP158Block:    big.NewInt(3),
+		ByzantiumBlock: big.NewInt(math.MaxInt64), // Don't enable yet
 
 		Clique: &CliqueConfig{
 			Period: 15,
@@ -110,7 +110,7 @@ type ChainConfig struct {
 	EIP155Block *big.Int `json:"eip155Block,omitempty"` // EIP155 HF block
 	EIP158Block *big.Int `json:"eip158Block,omitempty"` // EIP158 HF block
 
-	MetropolisBlock *big.Int `json:"metropolisBlock,omitempty"` // Metropolis switch block (nil = no fork, 0 = alraedy on homestead)
+	ByzantiumBlock *big.Int `json:"byzantiumBlock,omitempty"` // Byzantium switch block (nil = no fork, 0 = alraedy on homestead)
 
 	// Various consensus engines
 	Ethash *EthashConfig `json:"ethash,omitempty"`
@@ -147,7 +147,7 @@ func (c *ChainConfig) String() string {
 	default:
 		engine = "unknown"
 	}
-	return fmt.Sprintf("{ChainID: %v Homestead: %v DAO: %v DAOSupport: %v EIP150: %v EIP155: %v EIP158: %v Metropolis: %v Engine: %v}",
+	return fmt.Sprintf("{ChainID: %v Homestead: %v DAO: %v DAOSupport: %v EIP150: %v EIP155: %v EIP158: %v Byzantium: %v Engine: %v}",
 		c.ChainId,
 		c.HomesteadBlock,
 		c.DAOForkBlock,
@@ -155,7 +155,7 @@ func (c *ChainConfig) String() string {
 		c.EIP150Block,
 		c.EIP155Block,
 		c.EIP158Block,
-		c.MetropolisBlock,
+		c.ByzantiumBlock,
 		engine,
 	)
 }
@@ -182,8 +182,8 @@ func (c *ChainConfig) IsEIP158(num *big.Int) bool {
 	return isForked(c.EIP158Block, num)
 }
 
-func (c *ChainConfig) IsMetropolis(num *big.Int) bool {
-	return isForked(c.MetropolisBlock, num)
+func (c *ChainConfig) IsByzantium(num *big.Int) bool {
+	return isForked(c.ByzantiumBlock, num)
 }
 
 // GasTable returns the gas table corresponding to the current phase (homestead or homestead reprice).
@@ -243,8 +243,8 @@ func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *Confi
 	if c.IsEIP158(head) && !configNumEqual(c.ChainId, newcfg.ChainId) {
 		return newCompatError("EIP158 chain ID", c.EIP158Block, newcfg.EIP158Block)
 	}
-	if isForkIncompatible(c.MetropolisBlock, newcfg.MetropolisBlock, head) {
-		return newCompatError("Metropolis fork block", c.MetropolisBlock, newcfg.MetropolisBlock)
+	if isForkIncompatible(c.ByzantiumBlock, newcfg.ByzantiumBlock, head) {
+		return newCompatError("Byzantium fork block", c.ByzantiumBlock, newcfg.ByzantiumBlock)
 	}
 	return nil
 }
@@ -312,7 +312,7 @@ func (err *ConfigCompatError) Error() string {
 type Rules struct {
 	ChainId                                   *big.Int
 	IsHomestead, IsEIP150, IsEIP155, IsEIP158 bool
-	IsMetropolis                              bool
+	IsByzantium                               bool
 }
 
 func (c *ChainConfig) Rules(num *big.Int) Rules {
@@ -320,5 +320,5 @@ func (c *ChainConfig) Rules(num *big.Int) Rules {
 	if chainId == nil {
 		chainId = new(big.Int)
 	}
-	return Rules{ChainId: new(big.Int).Set(chainId), IsHomestead: c.IsHomestead(num), IsEIP150: c.IsEIP150(num), IsEIP155: c.IsEIP155(num), IsEIP158: c.IsEIP158(num), IsMetropolis: c.IsMetropolis(num)}
+	return Rules{ChainId: new(big.Int).Set(chainId), IsHomestead: c.IsHomestead(num), IsEIP150: c.IsEIP150(num), IsEIP155: c.IsEIP155(num), IsEIP158: c.IsEIP158(num), IsByzantium: c.IsByzantium(num)}
 }
diff --git a/tests/init.go b/tests/init.go
index 0c3fe61d13..a2c633ad67 100644
--- a/tests/init.go
+++ b/tests/init.go
@@ -45,13 +45,13 @@ var Forks = map[string]*params.ChainConfig{
 		EIP158Block:    big.NewInt(0),
 	},
 	"Byzantium": &params.ChainConfig{
-		ChainId:         big.NewInt(1),
-		HomesteadBlock:  big.NewInt(0),
-		EIP150Block:     big.NewInt(0),
-		EIP155Block:     big.NewInt(0),
-		EIP158Block:     big.NewInt(0),
-		DAOForkBlock:    big.NewInt(0),
-		MetropolisBlock: big.NewInt(0),
+		ChainId:        big.NewInt(1),
+		HomesteadBlock: big.NewInt(0),
+		EIP150Block:    big.NewInt(0),
+		EIP155Block:    big.NewInt(0),
+		EIP158Block:    big.NewInt(0),
+		DAOForkBlock:   big.NewInt(0),
+		ByzantiumBlock: big.NewInt(0),
 	},
 	"FrontierToHomesteadAt5": &params.ChainConfig{
 		ChainId:        big.NewInt(1),
@@ -69,12 +69,12 @@ var Forks = map[string]*params.ChainConfig{
 		DAOForkSupport: true,
 	},
 	"EIP158ToByzantiumAt5": &params.ChainConfig{
-		ChainId:         big.NewInt(1),
-		HomesteadBlock:  big.NewInt(0),
-		EIP150Block:     big.NewInt(0),
-		EIP155Block:     big.NewInt(0),
-		EIP158Block:     big.NewInt(0),
-		MetropolisBlock: big.NewInt(5),
+		ChainId:        big.NewInt(1),
+		HomesteadBlock: big.NewInt(0),
+		EIP150Block:    big.NewInt(0),
+		EIP155Block:    big.NewInt(0),
+		EIP158Block:    big.NewInt(0),
+		ByzantiumBlock: big.NewInt(5),
 	},
 }
 
diff --git a/tests/transaction_test.go b/tests/transaction_test.go
index 72d43c0ece..c743996c2a 100644
--- a/tests/transaction_test.go
+++ b/tests/transaction_test.go
@@ -37,12 +37,12 @@ func TestTransaction(t *testing.T) {
 		EIP158Block:    big.NewInt(0),
 		ChainId:        big.NewInt(1),
 	})
-	txt.config(`^Metropolis/`, params.ChainConfig{
-		HomesteadBlock:  big.NewInt(0),
-		EIP150Block:     big.NewInt(0),
-		EIP155Block:     big.NewInt(0),
-		EIP158Block:     big.NewInt(0),
-		MetropolisBlock: big.NewInt(0),
+	txt.config(`^Byzantium/`, params.ChainConfig{
+		HomesteadBlock: big.NewInt(0),
+		EIP150Block:    big.NewInt(0),
+		EIP155Block:    big.NewInt(0),
+		EIP158Block:    big.NewInt(0),
+		ByzantiumBlock: big.NewInt(0),
 	})
 
 	txt.walk(t, transactionTestDir, func(t *testing.T, name string, test *TransactionTest) {