Petulantes

This assumption is based on the fact that Constantine had possibly had them portrayed on his triumphal arch in Rome.

One of the standard-bearers of the Petulantes, Maurus, put the crown on Julian's head, proclaiming him Augustus (361).

[3] In 365, the Augustus Senior of the west, Valentinian I, and the Augustus Iunior of the east, Valens, divided the army in two parts, and it is possible that in this occasion the Petulantes were divided into two units, the seniores and the iuniores.

The Notitia Dignitatum, an early-5th century document, lists the Petulantes seniores among the auxilia palatina, the elite units, under the command of the magister peditum of the west.

[4] The same document gives the Petulantes iuniores under the command of the magister militum per Illyricum, with a different shield pattern.