Original: Biography Acquiring titles Ferdinand was born in Sos del Rey Católico , and was the son of John II of Aragon ( whose family was a cadet branch of the House of Trastámara ) by his second wife , the Castilian noblewoman Juana Enríquez .
Simplified: Biography Ferdinand was the son of John II of Aragon by his second wife , the Aragonese noblewoman Juana Enriquez .