Persianate Turkoman confederation ('White Sheep') that overthrew the rival Qara Qoyunlu in 1468 and, under Uzun Hasan, briefly ruled an empire spanning Iran, Iraq, and eastern Anatolia before Ottoman and Safavid pressure fragmented it.
Collapsed into civil war after Sultan Ya'qub's death (c. 1490); the rising Safavid Empire under Ismail I absorbed its territory through the 1500s, with the confederation's political rule generally dated to end by 1503 (Wikidata) though the last claimant was killed by Safavid forces as late as 1508 per some narratives.
The atlas holds 3 border frames for Aq Qoyunlu (White Sheep Turkomans) — the shape you scrub through changes in 1378 · 1446 · 1469.
The standard English-language scholarly monograph on the Aq Qoyunlu, revised edition (University of Utah Press); original 1976 edition also verified on Open Library.