Caballero
Defined in 3 dictionaries — Ballentine's (1916), Black's (1910), Black's (1891)
Ballentine's Law Dictionary
James A. Ballentine · 1916
(Spanish) A knight.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In Spanish law. A knight. So called on account of its being more honorable to go on horseback (a caballo) than on any other beast.
A Dictionary of Law
Henry Campbell Black · 1891
In Spanishlaw. A knight. So called on aecount of its being more honorable to go on horseback (& cabatlo) than on any other beast.