[10] Long before the death of his father Abdulaziz was announced the next ruler of the state at the request of Muhammad bin Abdul Wahhab.
[12] These attacks were followed by those against the Sudair and Jalajil tribes who did not join the religious movement of Muhammad bin Abdul Wahhab.
[12] Abdulaziz's Bay'ah (Arabic: Pledge of allegiance) ceremony was supervised by Muhammad bin Abdul Wahhab.
[2] However, following the capture of Riyadh Abdulaziz bin Muhammad himself began to control the budget of the state due to the significant increase in revenues.
[23] They also demolished the heterodox texts and innovative household equipment such as mirrors and window frames and robbed the wealth of the local people.
[26] However, due to the Ottoman attacks in Hejaz Abdulaziz bin Muhammad did not manage to fully consolidate his power in Bahrain and had to reduce his forces there which allowed the Al Khalifa to reestablish their rule.
[22] The attacks of the Saudi forces reached Syria, Iraq and Yemen where Abdulaziz managed to establish his authority.
[26] In 1802 Abdulaziz bin Muhammad's forces led by his heir and son Saud attacked Karbala and Najaf in Iraq.
[27] They massacred thousands of the Shia population, stole enough precious loot to load 4,000 camels, and destroyed the dome over the shrine of Imam Hussain.
[29] This incident also had another and much more significant effect: it added a sectarian nuance to the Sunni-Shia divide in the Muslim world.
[29] The observations of Lieutenant Francis Warden, a British military official, about the attack are as follows:[30] They pillaged the whole of it [Karbala], and plundered the Tomb of Hussein...slaying in the course of the day, with circumstances of peculiar cruelty, above five thousand of the inhabitants...Abdulaziz married to the daughter of Muhammad bin Abdul Wahhab and the daughter of Uthman bin Mu'ammar, the ruler of Uyayna.
He crossed the desert of Arabia on a dromedary, entered the tent of Abdulaziz while he was at prayers, and plunged a cangiar into his breast crying, "Let this avenge the tomb of Ali, for thy profanations."
[3][8] A student of his father-in-law, Abdul Wahab, Abdulaziz followed his footsteps in writing on tawhid and the avoidance of grave-worshiping and other such related matters, his epistles being praised by Al-Shawkani, a scholar.