Question: When is Ishar Singh (Sikh Prince)'s father's birthday?
Sentence (from "Ranjit Singh"): His legacy includes a period of Sikh cultural and artistic renaissance, including the rebuilding of the Harmandir Sahib in Amritsar as well as other major gurudwaras, including Takht Sri Patna Sahib, Bihar and Hazur Sahib Nanded, Maharashtra under his sponsorship.
Relevant evidence: No