Background
She was the only daughter of Swargadeo Jayadhwaj Singha, king of Ahom Dynasty and his wife Pakhori Gabharu, the daughter of Momai Tamuli Borbarua. Rahmat Banu Begum was born as Ahom princess (Rajkumari) and was the only daughter of Swargadeo Jayadhwaj Singha, king of Ahom Dynasty and his wife Pakhori Gabharu. She was the maternal granddaughter of Momai Tamuli Borbarua, was an able administrator and the commander-in-chief of the army in the Ahom kingdom and the niece of Lachit Borphukan and Laluksola Borphukan who are known for their participation in the Battle of Saraighat that thwarted a drawn-out attempt by Mughal forces under the command of Ram Singh I to take back Kamrup.