Sheikhdom of Zubarahball

The Sheikhdom of Zubarahball, more known as Bani Utbahball or Utub Federationball was a former Arab tribal confederation centered in the city of Zubarah in  Qatar.

History
He declared independence from the Khalidi Emirate in 1732 as a city-state and began to expand his territories in 1783 conquering Bahrain from the  Persians, which were planning to invade their capital Zubarah.

During the expansion of the Emirate of Diriyah, he was made a vassal of the Emirate in 1801, but then declaring independence again in 1818 with his fall and later expanding more, conquering the city of Mombasa from the Portuguese in 1837.

A new Saudi State, the Emirate of Nejd was founded in 1824 and started expanding again, then in 1840 the Sheikhdom was conquered again and was made a vassal of Nejd, later getting annexed in 1872 and eventually losing Bahrain to the  British Empire, ending his existence.