Question: When was Nizar Al-Mustafa's father born?
Sentence (from "Nizar al-Mustafa"): Following the death of his father, Al-Mustansir Billah, he was deposed by his brother, Ahmad al-Musta‘lī but his son, Ali al-Hādī ibn Nizār, escaped to Alamūt and took refuge with believers there, thereby continuing the Imāmate.
Relevant evidence: Yes