In classical Celtic polytheism, Abgatiacus was a theonym referring to a Gallo-Roman deity. The theonym is known only from a single inscription found with a representation of the god discovered at Noviomagus Trevirorum, now Neumagen-Dhron in Germany. ^[1] The god bearing the name was assimilated to Mercury and is depicted in the company of Rosmerta. ^[1] He holds the caduceus in his hand and at his feet is a rooster. ^[1] The inscription in which the theonym appears reads as follows:

IN HONOR(EM) D(OMVS) D(IVINAE) MERCVR(IO) ABGATIAC(O) ROSMERTAE AEDEM QVI FILIVS ^[1]