: auxilium palatinum) were infantry units of the Late Roman army, first raised by Constantine I as part of the new field army he created in about 325 AD.
Some of the senior and probably oldest of these units had special names such as Cornuti or Brachiati; others were named after the tribes from which they were recruited (many of these in eastern Gaul, or among the German barbarians).
There is no direct evidence for the strength of an auxilium, but A. H. M. Jones (History of the Later Roman Empire, Blackwell, Oxford, 1964 p 682) estimates that it may have been 600 or 700.
Some auxilia are attested as limitanei, especially on the Danube.
List of the auxilia palatina included in the early 5th-century Notitia Dignitatum, which depicts also some of the shield patterns of the units.