After the Muslims were conquered in 1492, they were guaranteed religious freedom. Despite the Treaty of Granada, this tolerance was short lived. By 1499, Cardinal Cisneros began forcing conversion to Christianity. Those who refused were imprisoned or excelled. Within two years, all remaining Muslims were considered converted. The next atrocity was the destruction of mosques. They were replaced with churches. Among the first to be built was Iglesia de San Cristóbal in the Albaicín Quarter.