Q. Who was the son of Peshwa Bajirao I and Mastani?
Answer: Shamsher Bahadur I
Notes: Shamsher Bahadur I, born Krishna Rao, was the only son of Bajirao I and Mastani. He ruled Banda and Kalpi, fought in the Third Battle of Panipat, and died in 1761. His lineage held power in Bundelkhand and initially remained loyal to the Maratha confederacy.