Capitaneus
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
He who held his land or title directly from the king himself. A commander or ruler over others, either in civil, military, or ecclesiastical matters.
A naval commander
This latter use began A. D. 1264. Spelman, voc. "Capitaneus;" "Admiralius."