The Bürüciye Medrese is a fine building from 1271. I quote from the notice at its entrance: Muzafer Burucerdi, who came from the area of Hamedan in Iran and settled down in Sivas was one of the richest people in Sivas. The Bürüciye Medrese was built under his orders in 1271 to teach positive science. The medrese which has an open courtyard and four eyvans (three walled vaulted antechambers) is one of the most beautiful examples of Seljuk stonework. The notice mentions a tomb of the founder and his two children with very fine tiles. Unfortunately that was under lock and key.
The place houses a teahouse, so you can sit in and enjoy the courtyard. The stonework on the front is excellent, as I hope to illustrate with some pictures.