Naser al-Din Shah (Tir 25, 1210 - May 12, 1275 / July 16, 1831 - May 1, 1896), who before the reign of Naser al-Din was called Mirza, known as "Kiblah of the Scholar", "Sultan of the Qur'an" and after being killed by Mirza Reza Kermani, "Shah" Shahid", was the fourth Shah of Iran from the Qajar dynasty. He reigned for nearly 50 years from 1227 to 1275, after Shapur II of the Sassanids and Tahmaseb I of the Safavid dynasty, the longest reign among all the kings in the history of Iran. 