The second type, the "principes", typically formed the second rank of soldiers back from the front of a battle line. They were heavy infantry soldiers armed and armoured as per the "hastati". The "triarii", who typically formed the third rank when the army was arrayed for battle, were the last remnant of hoplite-style troops in the Roman army. They were armed and armoured as per the "principes", with the exception that they carried a pike rather than two "pila". A "triarii" maniple was divided into two formations each six men across by 10 men deep. A manipular legion typically contained between 1,200 "hastati", 1,200 "principes" and 600 "triarii". The three classes of unit may have retained some slight parallel to social divisions within Roman society, but at least officially the three lines were based upon age and experience rather than social class. Young, unproven men would serve as "hastati", older men with some military experience as "principes", and veteran troops of advanced age and experience as "triarii".