Abu'l-Abbas Ahmad ibn Abdallah al-Muqtadi () usually known simply by his regnal name Al-Mustazhir billah () (b. April/May 1078 – 6 August 1118 d.) was the Abbasid Caliph in Baghdad from 1094 to 1118. He succeeded his father al-Muqtadi as the Caliph. The main and important events during his reign are; appearance of the First Crusade in Western Syria, Muslim protest in Baghdad against crusaders, His efforts to help Mawdud to organized several expeditions to reconquer lands from the Crusaders. Biography Al-Mustazhir's father was caliph Al-Muqtadi. Al-Muqtadi had one concubine, Taif Al-Afwah. She was an Egyptian, and was the mother of his son, the future Caliph Al-Mustazhir. He was born in 1078 CE (the 5th Islamic century). Al-Mustazhir's full name was Ahmad ibn Abdallah al-Muqtadi and his Kenya was Abu'l-Abbas. When his father died on 3 February 1094 at the age of 37 – 38. Al-Mustazhir succeeded him. At the time of accession to the throne, he was just sixteen years old. Amid ad-Dawla would remain Abbasid vizier until 1099 or 1100, when he was removed from office and imprisoned by the Seljuk sultan Berkyaruq. There are different accounts for Amid ad-Dawla's downfall – in one, Mu'ayyad al-Mulk, who had succeeded his father Nizam al-Mulk as Seljuk vizier, had offered the Abbasid vizierate to al-A'azz, and the two collaborated to remove him from office without input from Barkyaruq. In another, Barkyaruq himself fired Amid ad-Dawla and fined him "an enormous sum" for misappropriating government funds before imprisoning him. In any case, Amid ad-Dawla died in prison shortly after, in 1100. After Amid ad-Dawla's downfall, his brother al-Kafi served as vizier to the Abbasid caliph al-Mustazhir from 1102/3 until 1106/7 and then again from 1108/9 until 1113/4. During Al-Mustazhir's twenty-four year incumbency he was politically irrelevant, despite the civil strife at home and the appearance of the First Crusade in Syria. An attempt was even made by crusader Raymond IV of Toulouse to attack Baghdad, but he was defeated near Mersivan during the Crusade of 1101. The global Muslim population had climbed to about 5 per cent as against the Christian population of 11 per cent by 1100. In the year 492 AH (AD 1099), Jerusalem was captured by the crusaders and its inhabitants were massacred. Preachers travelled throughout the caliphate proclaiming the tragedy and rousing men to recover from infidel hands the Al-Aqsa Mosque, the scene of the Prophet's heavenly