EntityQ1462894· pop 14· linked from 1,251 articlesHelenopolisSign in to saveancient city of Bithynia in modern-day TurkeyConnectionsTroyEntityLystraEntityIsaura PalaeaEntityIstanbulCityGreekEntityCatholic ChurchEntityByzantine EmpireEntitygeographic coordinate systemEntityInternational Standard Book NumberEntityConstantine the GreatEntityAnatoliaEntityJustinian IEntitypublic domainEntityJohn ChrysostomEntityEphesusEntityAmasyaEntityErzurumEntityTarsusEntityAlanyaEntityFirst Council of NicaeaEntityCategoriesCatholic titular sees in AsiaDefunct dioceses of the Ecumenical Patriarchate of ConstantinopleFormer populated places in TurkeyHelena, mother of Constantine IHistory of Christianity in TurkeyPopulated places in BithyniaPopulated places of the Byzantine EmpireRoman BithyniaRoman towns and cities in Turkey