Designed to hold a 1,000-strong regiment of auxiliary infantrymen, it was linked by Roman roads to the main legionary bases at Chester and Caerleon.
Roedd y gaer, a fwriadwyd ar gyfer dal catrawd o 1,000 o filwyr traed cynorthwyol, wedi’i chysylltu â'r prif ganolfannau llengol yng Nghaer a Chaerllion gan ffyrdd Rhufeinig.