A Turkish Anatolian beylik centered on Kütahya in western Anatolia that gained sovereignty as the Sultanate of Rum collapsed; a major regional power whose territory passed to the Ottomans largely through a royal dowry marriage in the 1370s-80s rather than outright conquest.
The last independent ruler Yakub II, lacking male heirs, willed the beylik to the Ottoman sultan Murad II upon his death in 1429.
The dedicated scholarly history of the Germiyanid beylik across its exact founding-to-dissolution dates.