Xerxes's estimated time of arrival at Thermopylae coincided with both the Olympic Games and the festival of Carneia. For the Spartans, warfare during these periods was considered sacrilegious. Despite the uncomfortable timing, the Spartans considered the threat so grave that they dispatched their king Leonidas I with his personal bodyguard (the "Hippeis") of 300 men. The customary elite young men in the Hippeis were replaced by veterans who already had children. Leonidas was supported by contingents from the Allied Peloponnesian cities, and other forces that the Allies picked up on the way to Thermopylae. The Allies proceeded to occupy the pass, rebuilt the wall the Phocians had built at the narrowest point of the pass, and waited for Xerxes's arrival.