Yakup I of Germiyan (died after 1327) was the TurkmenRudi Paul Lindner , Explorations in Ottoman Prehistory p:76 founder of the

Germiyanid The Germiyanids ( tr, Germiyanoğulları Beyliği or ''Germiyan Beyliği'') was a prominent Anatolian beylik established by the Oghuz Turkish tribes (probably the Afshar tribe) after the decline of Sultanate of Rûm. However, while the be ...

beylik in

Kütahya Kütahya () (historically, Cotyaeum or Kotyaion, Ancient Greek, Greek: Κοτύαιον) is a city in western Turkey which lies on the Porsuk River, Porsuk river, at 969 metres above sea level. It is inhabited by some 578,640 people (2022 estimate) ...

. He was the son of Kerimüddin Alişir and was succeeded by

Mehmed I of Germiyan Mehmed (modern Turkish: Mehmet) is the most common Bosnian and Turkish form of the Arabic name Muhammad ( ar, محمد) (''Muhammed'' and ''Muhammet'' are also used, though considerably less) and gains its significance from being the name of Muh ...

Reign

He refused to recognize the authority of

Mesud II Ghiyath al-Dīn Me’sud ibn Kaykaus or Mesud II ( 1ca, مَسعود دوم, ''Ghiyāth ad-Dīn Mas'ūd bin Kaykāwūs'' ( fa, غياث الدين مسعود بن كيكاوس) bore the title of Sultan of Rûm at various times between 1284 and 1 ...

and swore allegiance to the

Ilkhanids The Ilkhanate, also spelled Il-khanate ( fa, ایل خانان, ''Ilxānān''), known to the Mongols as ''Hülegü Ulus'' (, ''Qulug-un Ulus''), was a khanate established from the southwestern sector of the Mongol Empire. The Ilkhanid realm, ...

, which led to the establishment of his state. He gathered a significant amount of power and raided westwards, forcing the local

Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...

to pay tribute for some time. He lost

Alaşehir Alaşehir (), in Antiquity and the Middle Ages known as Philadelphia ( el, Φιλαδέλφεια, i.e., "the city of him who loves his brother"), is a town and district of Manisa Province in the Aegean region of Turkey. It is situated in the va ...

to a force of Byzantine mercenaries from Catalonia, but retook it in 1314. He also conquered Ayasluğ (present Selçuk) and Angir (present Simav). He established a number of foundations and mosques in

Afyon Afyonkarahisar (, tr, afyon "poppy, opium", ''kara'' "black", ''hisar'' "fortress") is a city in western Turkey, the capital of Afyon Province. Afyon is in the mountainous countryside inland from the Aegean coast, south-west of Ankara along t ...

References

* Büyük Larousse, vol. 24, p. 12368, Milliyet Gazetesi Yayınları, "Yakup Bey I" Turkic rulers 1327 deaths People from Kütahya History of Kütahya Province Germiyan Year of birth unknown {{Asia-royal-stub