Trimarcisia

Trimarcisia was the Celtic practice of taking two ‘servants’ into battle to act as attendants. First recorded by the Greek writer Pausanias, he described the actions of the Celtic cavalry at the Battle of Thermopylae, explaining that each mounted warrior had two servants who were skilled riders in their own right. They remained behind the ranks until their master needed a new mount, was injured, or killed. If the warrior took a wound one of the riders would take him back to camp while the other took his place in battle.