|Architectural style||Islamic, Seljuk architecture|
|Direction of façade||west-southwest|
|Width||31.25 m (102.5 ft)|
|Minaret height||25 m (82 ft)|
The medrese was commissioned by Sahip Ata Fahrettin Ali, a vizier and the de facto ruler of Seljuk Sultanate of Rûm after the death of Pervane in 1277. Up to 1271, he was usually in good terms with Pervane. He commissioned many buildings in Anatolia. Gökmedrese is one of the most imposing of all. The original name of the medrese is Sahibiye, referring to Sahip Ata. But it is usually known as Gökmedrese, because of the sky-blue tiles used at the building.
The medrese was constructed by a Armenian or Cappadocian Greek, from Konya. architect known as "Kaloyan" (Konya was the capital of Seljukids.) Originally, it was a two storey building. There were also a hamam (Turkish bath) and a soup kitchen for 30 people. But presently, only the 13 rooms of the lower floor exist. It was restored in 1823 and was in use up to 1926.
There are two 25 m (82 ft) high minarets, one at each side of the portal. The width of the building is 31.25 m (102.5 ft). The dimensions of the courtyard is 24.25 m × 14.40 m (79.6 ft × 47.2 ft). There are two divisions, one leading to the mescit (prayer room) and the other to class rooms.
In middle age Islamic countries Vakıf was a source of revenue, endowed for the exploitation and the maintenance of the foundations as well as for the salaries of the staff. In Gökmedrese case, there were 85 markets, nine villages, two farms and some other sources endowed as vakfiye.
Muqarnas on the portal.
- А. Л. Якобсон (1983). "Сельджукские отклики на темы армянский средневековой архитектуры.". № 4 . стр-цы. 126-130. ISSN 0135-0536. Историко-филологический журнал. Archived from the original (PDF) on 2013-01-09. Retrieved 2012-11-17.
- Maxim Yevadian: Les Seldjouks et les architectes arméniens, Les Nouvelles d'Arménie Magazine, Nr. 156, October 2009, p. 73.
- Ars Islamica / Detroit Institute of Arts. Research Seminary in Islamic Art / University of Michigan Press, 1939 - p. 67
La signature Kaloyan du Gok Medrese de Sivâs (1270) est également arménienne
- Speros Vryonis (1981). Studies on Byzantium, Seljuks, and Ottomans. p. 282.
Perhaps the best known of these architects was the Greek from Konya, Kaloyan, who worked on the Ilgin Han in 1267-8 and three years later built the Gök Medrese of Sivas.
- http://eskidergi.cumhuriyet.edu.tr/makale/1290.pdf (Turkish)