The medrese built by Sinan (finished in 1550 according to a foundation stone) is octagonal in plan, with a a series of 24 portico's and that many cells in groups of three surrounding a ablutions fountain in the centre. The building is made into a square by adding auxiliary rooms like baths and lavatories in the corners. On one side is a lecture room which projects from the square on the outside like a great apse. Over 10 years ago I took just one picture, making up for that error in December 2015.

In some cells there is an exhibition on a Sunni theologian, Said Nursi, who wrote the "Risale-i Nur Collection, a body of Qur'anic commentary exceeding six thousand pages."(Wikipedia).