 Complete the following phrase:  By 633, under the rule of Abu Bakr, the Rashidun Caliphate consolidated the region. The Shammar tribe emerged to be the most powerful in the region in later years and by 1791, Prince Abdullah bin Ali al-Rasheed of the Shammar consolidated the region under his rule, whose state acted as a precursor to the Emirate of Jabal Shammar, which was formed in 1834 by the Rashidi dynasty. The Emirate of Jabal Shammar fought several wars against the new Saudi state to the south, supported by the Ottomans, but in 1921, King Abdulaziz of the House of Saud conquered its capital city, Hail, during the 