King Leonidas led his 300 Spartans in to battle against the Persian army. After King Xerxes demanded that Sparta pay tribute, Leonidas killed the Persian messenger and prompted the great battle of Thermopylae. Feel the wrath of Sparta this Halloween with Halloween31′s (www.halloween31.com) 300 inspired costumes! Fight off Immortals this Halloween as a Spartan warrior. Halloween31 has the perfect 300 Immortal Costume and 300 Spartan Costume.