Henry of Trastamara (
1333? -
1379), was the illegitimate son of
Alfonso XI of Castile and Leonora de Guzman, and half brother to
Peter I of Castile. Became
Henry II of Castile in
1366 when, as head of a host of soldiers of fortune, and with the aid of
Bertrand du Guesclin[?], he drove Peter from his throne without giving battle. Henry murdered Peter in
1369. Married to Joan, daughter of
John Manuel of Villena[?], head of a younger branch of the royal house of Castile. Their son was
John I of Castile.