What is tribunus laticlavius?

Tribunus laticlavius was a military officer in ancient Rome who held the rank of tribune of the legion. The term "laticlavius" refers to the broad stripe on the tunic of a Roman senator or equestrian, which identified his rank. Tribunus laticlavius was one of the highest-ranking officers in the legion, subordinate only to the legatus and the praefectus castrorum. He was responsible for overseeing the training and discipline of the soldiers under his command, and for directing them in battle. The position of tribunus laticlavius was typically held by young aristocrats who were seeking to gain military experience and establish themselves in Roman society.