Mosque–Cathedral of Córdoba construction of the Great Mosque, which was considerably expanded by later Muslim rulers. Córdoba returned to Christian rule in 1236 during the Reconquista, and the building was converted to a Roman Catholic church, culminating in the insertion of a Renaissance cathedral nave in the 16th century. Since the early 2000s, Spanish Muslims have lobbied the Roman Catholic Church to allow them to pray in the cathedral. This Muslim campaign has been rejected on multiple occasions, both by the church authorities in Spain and by the Vatican. It is commonly believed that the site of the Mosque-Cathedral was originally a Christian
Roman Catholic Diocese of Tianjin and 60,000 is the estimated number of underground faithful. Even that considered, it is still only a very tiny proportion of the current 15,000,000 population (0.7%). Roman Catholic Diocese of Tianjin The Roman Catholic Diocese of Tianjin/Tíentsín (Latin:, ) is a suffragan diocese in the Ecclesiastical province of the Metropolitan Archbishop of Beijing in PR China. Its cathedral episcopal see is Cathedral of St. Joseph (Laoxikai Church), in the city of Tianjin, which also has the former cathedral: Our Lady of Victory Church (Wanghailou Church) (). Data from 1950 indicated there are 50,000 registered Roman Catholics in Tianjin, occupying 1.4%