This study examines a previously unpublished Latin inscription preserved in the stone arti­facts depot of the Gaziantep Zeugma Mosaic Museum. Although the exact context is unclear, the inscrip­tion must have been erected to commemorate a construction activity in which Publius Iulius Satto and Publius Victorinius Mercator, who served as contubernales in the Roman army, were likely involved. The inscription records that these individuals served in the first cohors within the centuria of the primus pilus. The tradition of naming centuriae after their commanders (centurio) disappeared from the 3rd century CE onwards; instead, as is the case in this inscription, they began to be named according to the duty title within the centuria. Since this title is given as primus pilus in the inscription, it is understood that these two contubernales, Satto and Mercator, were in the first centuria of the first cohors, the most prestigious unit in the legion. The inscription does not specify to which legion this unit was attached; however, it was most probably one of the legions temporarily stationed in the region and attested by numerous stamped tiles. Both the Celtic origin of the cognomen Satto and the exclusive concentration of the name Victorinius in the Rhineland point to a likely Gallo-Germanic origin for these contubernales. Based on the naming convention of the centuria, the inscription is dated to the 3rd century CE.