Marcus Caelius (c. March 45 BC – c. September AD 9) was the senior centurion (Primus pilus) in XVIII Roman Legion who was killed in the Battle of the Teutoburg Forest.

[2] Caelius is depicted wearing his military uniform, with phalerae (a type of military decoration), armillae (a type of bracelet), and a corona civica (an award for saving a fellow citizen's life), while in his right hand, he holds a vitis (carried by all centurions).

On either side of his image are his freedmen (non-combatant servants), Privatus and Thiaminus; both of whom perished in the battle.

The tombstone's lower left corner is damaged, but enough survives to determine that the text below the image once read:

LEM[ONIA TRIBV] FRATER FECITEnglish translation: To Marcus Caelius, son of Titus, of the Lemonian district, from Bologna, first centurion of the eighteenth legion.