Several other 'Uqailid lines were established in various areas, including Jazirat ibn Umar, Takrit, Hīt, and Ukbara (whose ruler, Gharib b. Muhammad once gave refuge to the Buwayhid amir Jalal al-Daula when he found it necessary to leave Baghdad).
Nonetheless, there is at least one real place with the name Uqbar, in Algeria, as well as a town called Ukbara in Iraq, each of which seems to have at least some aspects in common with Borges's fictional Uqbar.
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On the left bank of the Tigris between Samarra and Baghdad was the city of ‘Ukbarâ (عكبرا, q. v.), located along a river that flows southward out of Asia Minor, and the birthplace of at least two Jewish "heresiarchs", who led the "Okbarite" heretical movement within Karaism, itself a heresy in the eyes of orthodox Judaism.