 Complete the following phrase:  Hassan was appointed by the Umayyad caliph Abd al-Malik to lead the Arab reconquest of Ifriqiya modern-day Tunisia in North Africa. The chronology of Hassans campaign and those of his immediate predecessors is uncertain as a result of the different dates provided by the medieval sources. The historian Mohamed Talbi asserts that the accounts of the two earliest sources, Ibn Abd al-Hakam d. 871 and Ibn Qutayba d. 889, confirmed by Ibn Asakir d. 1175, are the most probable ... agrees with the logical sequence of events and makes it possible to avoid inconsistencies. Prior to Hassans appointment, Ifriqiya had fallen to the Berbers under Kasila and the Byzantines at the Battle of Vescera in 682. An initially successful attempt by Zuhayr ibn Qays al-Balawi to reconquer the region ultimately ended with Zuhayrs slaying and the Byzantines capture of Barce in Cyrenaica in . Abd al-Malik, having consolidated his control over the Caliphate in the Second Muslim Civil War and resumed 