Question: What is the date of death of Gastón De La Cerda, 3Rd Duke Of Medinaceli's father?
Sentence (from "Gastón de la Cerda, 3rd Duke of Medinaceli"): He was the second son of Don Juan de la Cerda, 2nd Duke of Medinaceli, by first wife Mencía Manuel de Portugal.
Relevant evidence: Yes