Question: Who is Haydar Mirza Safavi's paternal grandfather?
Sentence (from "Haydar Mirza Safavi"): Haydar Mirza Safavi (also spelled Haidar Mirza Safavi) was a Safavid prince, who declared himself as the king (shah) of Iran on 15 May 1576, the following day after his father Tahmasp I had died.
Relevant evidence: Yes