Wiktionary
shieldbearer
n. A person who carries a shield, especially a lower ranking person who carries it for a higher ranking person
Usage examples of "shieldbearer".
He concluded, 'Hanam said to tell you that you must know, as will Shadu, your Loremaster, Chiga, your Cupbearer, and Monis, your Shieldbearer, that all I have said is true.
But each principal was covered from the blows of the other by his second, the shieldbearer, who carried a shield for him and intercepted the strokes.