Thughur rejected Tulunid rule, forcing Ibn Tulun to go once again in person to Syria. Al-Mu'tamid used the moment to escape from his confinement in Samarra, and with a small entourage made for Tulunid domains. Messengers from the Caliph reached Ibn Tulun at Damascus, and the ruler of Egypt halted and awaited the Caliph's arrival with great anticipation: not only would the sole source of political legitimacy in the Muslim world reside under his control, but he would also be able to pose as the "rescuer" of the Caliph from his overreaching brother. In the event, however, Sa'id ibn Makhlad managed to alert the governor of Mosul, Ishaq ibn Kundaj, who overtook and defeated al-Mu'tamid and his escort at al-Haditha on the Euphrates. Al-Mu'tamid was brought back to Samarra (February 883), where he was placed under virtual house arrest in the Jawsak Palace. In May/June, he was even moved south to Wasit, where al-Muwaffaq could keep an eye on him in person. Only in March 884 was the powerless Caliph allowed to return to Samarra. In the meantime, he was obliged to denounce Ibn Tulun, and appoint—nominally at least—Ishaq ibn Kundaj as governor of Syria and Egypt. In 886/7, the Caliph conferred the title of "king" on the long-time ruler of Armenia, Ashot I (). Although the Armenian king continued to pay tribute to the Abbasid court and recognize its suzerainty, both he and the various minor Armenian princes were de facto independent monarchs. Rise of al-Mu'tadid and death In 889, al-Muwaffaq fell out with his son, Abu'l-Abbas, for reasons that are unclear, and had him imprisoned. Al-Muwaffaq spent the next two years on campaign in the Jibal in what is now western Iran. By the time he returned to Baghdad in May 891, al-Muwaffaq was already nearing death. The garrison commander of Baghdad, and the vizier Isma'il ibn Bulbul, hatched a plot to keep Abu'l-Abbas imprisoned and allow power to pass to al-Mu'tamid. Therefore, they invited the Caliph and his son to come the city, which they did. In the event, however, the attempt to sideline Abu'l-Abbas failed, due to his popularity with the soldiers and the common people: the soldiers set him free, and when al-Muwaffaq died on 2 June, Abu'l-Abbas immediately assumed his father's position. Abu'l-Abbas assumed the title of al-Mu'tadid bi-llah and took his father's position in the line of succession after the Caliph and al-Mufawwad.