Question: What is the date of death of Şehzade Mehmed Selaheddin's father?
Sentence (from "Murad V"): His mother, whom his father married in Constantinople on 1 August 1839, was Şevkefza Valide Sultan, an ethnic Circassian from the Ubykh tribe, daughter of Mehmed Bey Zaurum and his wife Cemile Hanım.
Relevant evidence: No