Ala Gallorum Petriana (English: "Petrianus' Ala of Gauls") was a Roman auxiliary unit. It is attested by military diplomas and inscriptions: in one inscription...

considerably expanded to the north and west to accommodate the larger Ala Gallorum Petriana, the nominally 1,000-strong cavalry regiment, the sole cavalry regiment...

It was probably occupied by a 500-strong cavalry unit called the Ala Gallorum Petriana but burnt down in AD 105. A second timber fort was built, guarding...

Luguvalium, which lay within sight, Petriana housed a nominal 1,000-strong cavalry regiment, the Ala Gallorum Petriana, the sole regiment of this size along...

Uxelodunum housed a nominal 1,000-strong cavalry regiment, the Ala Gallorum Petriana, the sole regiment of this size along the wall. Milecastle 65 was...

ancient literary sources. Under Hadrian there were 14 regiments of cavalry (ala, each about 500 strong) and 45 battalions of infantry (cohortes peditae,...