 ali bin jaafar bin muhammad bin ali bin abi talib almamun appointed him as his successor and he died a long time after almamuns life. it was said that he poisoned him and he had named him alrida.
علي بن جعفر بن محمد بن علي بن أبي طالب ولاه المأمون عهده، ومات إلى مديدة في حياة المأمون، وقيل أنه سمه، وكان سماه الرضا.