Acbărus, i, m.,
a title of the Arabian kings , among the Greeks and Romans , Tac. A. 12, 12; also written Abgarus and Abgar, Capit. Anton. 9; Inscr. Orell. no. 921.
Acbarus (Agbarus) ī, m the local title of the Arabian kings of Edessa: rex Arabum, Ta. ...
An Elementary Latin Dictionary