Abu Musa Utamish, vizier to the Abbasid Caliphate

Abu Musa Utamish was a Turkic military officer of the Abbasid Caliphate. He played an important role in the first years of the period known as the Anarchy at Samarra, during which he rapidly became one of the most powerful officials in the government. He was appointed as vizier upon the caliph al-Musta'in's ascension in 862, but was assassinated after approximately a year in office.

A vizier is a high-ranking political advisor or minister in the Near East. The Abbasid caliphs gave the title wazir to a minister formerly called katib (secretary), who was at first merely a helper but afterwards became the representative and successor of the dapir of the Sassanian kings.

The Abbasid Caliphate or Abbasid Empire was the third caliphate to succeed the Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abd al-Muttalib, from whom the dynasty takes its name. After overthrowing the Umayyad Caliphate in the Abbasid Revolution of 750 CE (132 AH), they ruled as caliphs based in modern-day Iraq, with Baghdad being their capital for most of their history.

June 6 is the 157th day of the year in the Gregorian calendar; 208 days remain until the end of the year.