Mehmed I of Great Seljuk

Muhammad I Tapar
Muhammad I Tapar and his court.
Sultan of the Great Seljuq Empire
Reign	1105–1118
Predecessor	Malik-Shah II
Successor	Mahmud II of Great Seljuq(in Iraq and Persia) Ahmed Sanjar (in Khorasan and Transoxiana)
Born	1082
Died	1118 Baghdad
Issue	Mahmud II of Great Seljuq
House	House of Seljuq
Father	Malik-Shah I
Religion	Sunni Islam

Muhammad I (also known as Ghiyath ad-Din Muhammad or Muhammad Tapar, died 1118) was a son of Seljuq Sultan Malik Shah I. In Turkish, Tapar means "he who obtains, finds".

He succeeded his nephew, Malik Shah II, as Seljuq Sultan in Baghdad, and thus was theoretically the head of the dynasty, although his brother Ahmed Sanjar in Khorasan held more practical power. Muhammad I probably allied himself with Radwan of Aleppo in the battle of Khabur river against Kilij Arslan I, the sultan of Rüm, in 1107, in which the latter was defeated and killed. Following the internecine conflict with his half brother, Barkiyaruq, he was given the title of malik and the provinces of Armenia and Azerbaijan. Dissatisfied by this he revolted again, but had to flee back to Armenia. By 1104, Barkiyaruq, ill and tired of war, agreed to divide the sultanate with Muhammad. Muhammad became sole sultan following the death of Barkiyaruq in 1105.

In 1106, Muhammad conquered the Ismaili fortress of Shahdiz, and ordered the Bavandid ruler Shahriyar IV to participate in his campaign against Ismailis. Shahriyar, greatly angered and feeling offended by the message Muhammad sent him, refused to aid him against the Ismailis. Shortly after Muhammad sent an army headed by Amir Chavli who tried to capture Sari but was unexpectedly defeated by an army under Shahriyar and his son Qarin III. Muhammad then sent a letter, which requested Shahriyar to send one of his sons child to the Seljuq court in Isfahan. He sent his son Ali I, who impressed Muhammad so much that he offered him his daughter in marriage, but Ali refused and told him to grant the honor to his brother and heir of the Bavand dynasty, Qarin III. Qarin III then went to Isfahan court and married her.