The Çilehane Camii is in fact an extensive complex with - apart from the mosque - a ‘Tekke’ of the Halveti Sufi Order annex ‘misafirhane’ (guesthouse), a türbe (tomb) and a ‘Çilehane’. It was built in 1413, in early Ottoman style, ordered by Yakup Paşa, a state official under sultan Mehmet I Çelebi. The building technique used alternating layers of natural stone and bricks. The 1939 earthquake left the complex heavily damaged; a comprehensive restoration in 1964 brought it back to its former impressive state.