There is a folk belief that 'Koçu Baba' was Seyit Hasan Sultan, one of the Horasan Turks, who gave his name to the tomb and mosque in Koçubaba village of Kırıkkale Balıseyh district, and that he came and settled in Balıseyh/Koçubaba in the 14th century. The exact date of construction of the tomb, which has an octagonal plan and is covered with a pointed cone, and does not have an inscription, is not known.

Sources:

https://dergipark.org.tr/tr/download/article-file/471148
https://www.kulturportali.gov.tr/turkiye/kirikkale/kulturenvanteri/kocubaba-turbesi