What form of armored heavy cavalry used in ancient warfare did Grivpanvar fought?
Grivpanvar The Grivpanvar (literally: neck-guard wearer), were an elite late Parthian and Sassanian division who fought as heavy knights or Cataphract cavalry. According to Roman sources, the Grivpanvar had the ability to impale two men on the long, heavy spears that they carried. Historical evidence suggests that the heavily armoured Parthian grivpanvar were at least partially influenced by the military of the Central Asian steppes, who in turn had inherited their armoured cavalry traditions from the Massagetae and the late Achaemenid Persians.
Cohors IV Aquitanorum equitata c.R. Cohors quarta Aquitanorum equitata civium Romanorum ("4th part-mounted Cohort of Aquitani Roman citizens") was a Roman auxiliary mixed infantry and cavalry regiment. It was probably originally raised in the Julio-Claudian era, perhaps under Augustus after the subjugation of the Aquitani in 26 BC. Alternatively, it may have been raised in a later levy of Aquitani after 14 AD. Unlike most Gauls, the Aquitani were not Celtic-speaking but spoke Aquitanian, a now extinct non Indo-European language closely related to Basque. Some tribes in Aquitania were Celtic-speaking, however e.g. the Bituriges.