Csíkszék () was one of the Székely seats in the historical Székely Land. It administered two sub-seats (Hungarian: fiúszék, Latin: sedes filialis), namely Gyergyószék and Kászonszék. It was divided on the natural borders of the region, as the main territory of Csíkszék lay in the valley of the Olt River, Gyergyószék lay in the valley of the Maros river, while Kászonszék lay in the valley of the Kászon river. Population The religious composition of Csíkszék's population in 1867 was as follows: Roman Catholic: 96,525 Greek Catholic: 13,028 Eastern Orthodox: 17 Others: 1.667 Total: 111,237 Gallery References Orbán, Balázs (1868). A Székelyföld leírása. Pest: Panda és Frohna Könyvnyomdája. States and territories established in the 12th century States and territories disestablished in 1876 1876 disestablishments in Hungary