There were many different types of gladiators in ancient Rome. Some of the first gladiators had been prisoners-of-war, and so some of the earliest types of gladiators were experienced fighters; Gauls, Samnites, and Thraeces (Thracians) used their native weapons and armor. Different gladiator types specialized in specific weapons and fighting techniques. Combatants were usually pitted against opponents with different, but more or less equivalent equipment, for the sake of a fair and balanced contest. Most gladiators only fought others from within the same school or ludus, but sometimes specific gladiators could be requested to fight one from another ludus.