Ali al-Ridha
Imam Reza Shrine in Mashhad, Iran contains the tomb of Ali al-Ridha, the eighth Shia Imam. Ali al-Ridha is believed, by members of the Shia, to have been poisoned there upon the orders of Caliph Al-Ma'mun and the place was subsequently called, "Mashhad ar-Ridhā" (the place of martyrdom of Ali al-Ridha). By the end of the 9th century a dome was built on the grave and many buildings and bazaars sprang up around it. For years totalling more than a millennium, the mosque was destroyed and reconstructed several times.