Due to the enormous military successes of the Roman Republic and the Roman Empire the legion has long been regarded as the prime ancient model for military efficiency and ability.
Originally, in the time of the Kings, the legio ("conscription") was the whole Roman army, composed of levied citizens. Much of Roman history of this era is founded on legends, but it is believed that during the reign of Servius Tullius, all Roman able-bodied, property-owning male citizens were first divided into five classes for military service based on wealth, since soldiers provided their own weapons and equipment.
- Legio V Macedonica
Legio V Macedonica ("Macedonian") was a Roman legion. It was probably originally levied by consul Gaius Vibius Pansa Caetronianus and Octavian in 43 BC, and it existed in Moesia at least until 5th century. Its symbol was the bull, but the eagle was used as well. The cognomen Macedonica comes from the fact that the legion was stationed in Macedonia for a period of its life.