Ala Gallorum Petriana

Fragment of inscription honoring one of the Prefects of the Ala Gallorum Petriana, found in Carlisle (CIL VII.929)

Ala Gallorum Petriana (English: "Petrianus' Ala of Gauls") was a Roman auxiliary unit. It is attested by military diplomas and inscriptions: in one inscription (RIB 957) it is referred to as Ala Augusta Petriana; in other inscriptions, Tacitus in his Histories,[1] and in the Notitia dignitatum it is called Ala Petriana.

The unit was an ala milliaria. The nominal strength of the ala was 720 men, consisting of 24 turmae each with 30 horsemen.

  1. ^ Histories, I.70