Some have said that the date of Zakaria ibn Adam 's death was between 819 and 835 CE (between 204 and 220 AH) and at the same time with the birth of Muhammad al-Jawad (the ninth Shia Imam).[1] Others have stated Zakaria ibn Adam passed away during the life of Muhammad al-Jawad and after his death, the Imam wrote about him in a letter: