Man-at-Arms
From superman.nu: Supermanica
Man-at-Arms is a weapons master with dual responsibilities in the kingdom of Eternia:
First, it has been his lifelong duty to train Prince Adam of Eternia, heir to the throne, in the art of weaponry. In this respect, he feels that he has failed, and that Prince Adam has learned nothing from him. (Little does he know that Prince Adam has employed the skills that he has learned in his dual identity as He-Man.)
Second, as a member of the Masters of the Universe, Man-at-Arms is part of a team that personally defends the Sorceress and the magical secrets that lie within the walls of Castle Grayskull.
(DCCP No. 47, Jul 1982: "From Eternia--with Death!")