The Muslim conquest of Egypt took place in AD 639, during the Byzantine empire. Despite the political upheaval, Egypt remained a mainly Christian, but Copts lost their majority status after the 14th century, as a result of the intermittent persecution and the destruction of the Christian churches there, accompanied by heavy taxes for those who refused to convert. From the Muslim conquest of Egypt onwards, the Coptic Christians were persecuted by different Muslims regimes, such as the Umayyad Caliphate, Abbasid Caliphate, Fatimid Caliphate, Mamluk Sultanate, and Ottoman Empire; the persecution of Coptic Christians included closing and demolishing churches and forced conversion to Islam.