Ali al-Ridha was the eighth Imam in Shia Islam, born in 766 CE in Medina. He is known for his deep knowledge of Islamic teachings and his role in promoting Islamic scholarship. His father was Musa al-Kadhim, and his mother was Najma. In 818 CE, Ali al-Ridha was appointed as the successor to the Abbasid Caliph Al-Ma'mun, which was a significant political move. He is revered for his efforts to bridge the gap between different Islamic sects and for his contributions to Islamic jurisprudence and theology. He passed away in 818 CE in Tus.