Built by the EdremitConquererand Seljuk Commander Yusuf Sinan in1231, Kurşunlu Mosque is on Kurşunlu Avenue in the Kapıcıbaşı neighborhood. It is a single dome mosque. The dome has been placed on an eight-corner pedestal, and the columns holding the arches are richly ornamented. The Mosque has been made of cut-stone however, the Ionic and Corinthian style columns holding the arches in the narthex area are thought to be brought from the surrounding antique cities. The two ostrich eggs hanging on the Mosque ceiling are remarkable. On the left side of the Mosque’s wooden door, there are hand-carved writings, while geometrical ornaments can be observed on other panels. The tablet in the Yusuf Sinan Shrine next to the Mosque, is the oldest inscription found around Balıkesir and is done in “grifthtuluth” style.