city, north-central Turkey. It lies at the confluence of the Tatlı and the Acı rivers. Gangra, capital of the ancient Paphlagonian kings, was incorporated into the Roman province of Galatia (c. 6 BC) and renamed Germanicopolis. It was captured by the Seljuq Turks after their victory over Byzantine forces at Malazgirt (AD 1071) and then changed hands several times among the various Turkmen dynasties until its final incorporation into the Ottoman Empire in the 15th century. A once-strong Byzantine fortress there is now in ruins. The city's great mosque was designed (c. 1550) by Sinan, court architect to the Ottoman sultan Süleyman I the Magnificent. The large nearby salt mines, known in Byzantine times, are still worked. Çankırı lies on the Ankara–Zonguldak rail line. The agricultural products of the surrounding area include grain and fruits, and Angora (Ankara) goats are raised for the silky wool that produces mohair. Pop. (2000) city, 62,508.