[1] They were brothers and Saqaliba, originally Slavic children that were captured, castrated, sold as slaves in Spain, and educated in the Islamic culture and religion.
As the result of a military coup, of which the details have been lost, they became joint rulers of Valencia in 1010.
Their administration was known for collecting 120,000 dinars of taxes a month, which was an extremely large sum at the time.
Mubarak died in a riding accident in 1018, and shortly thereafter Muzaffar was killed in an uprising.
[3] They were succeeded by Labib al-Saqlabi, also a former slave, who had been governor of Tortosa between 1015 and 1016, and probably was responsible for the rebellion against Muzaffar.