Abu Al-Hasan, Imam Ali ibn Musa Ar-Ridha عليه السلام was asked about the grave of Sayyida Fatimah Al-Zahra صلى الله عليه وعلى آله وسلم, and Imam عليه السلام said: "She was buried in her house, but when the Umayyads expanded the mosque, her grave became part of the mosque."
