when did the battle of thermopylae occur?
Greece
entailment
 The exact chronology of the battles of Thermopylae and Artemisium , and their relation to each other is somewhat unclear . The chronology below represents an estimated reconstruction of the time @-@ line , following Lazenby and Holland . 

entailment
 The Battle of Thermopylae ( / θərˈmɒpᵻliː / thər @-@ MOP @-@ i @-@ lee ; Greek : Μάχη τῶν Θερμοπυλῶν , Machē tōn Thermopylōn ) was fought between an alliance of Greek city @-@ states , led by King Leonidas of Sparta , and the Persian Empire of Xerxes I over the course of three days , during the second Persian invasion of Greece . It took place simultaneously with the naval battle at Artemisium , in August or September 480 BC , at the narrow coastal pass of Thermopylae ( " The Hot Gates " ) . The Persian invasion was a delayed response to the defeat of the first Persian invasion of Greece , which had been ended by the Athenian victory at the Battle of Marathon in 490 BC . Xerxes had amassed a huge army and navy , and set out to conquer all of Greece . The Athenian general Themistocles had proposed that the allied Greeks block the advance of the Persian army at the pass of Thermopylae , and simultaneously block the Persian navy at the Straits of Artemisium . 

entailment
 = = = August 480 BC : Battles of Thermopylae and Artemisium = = = 

neutral
 Three events allowed the Angevins ' successful termination of the conflict : 

neutral
 Three events allowed the Angevins ' successful termination of the conflict : 
