The ethnic makeup of Muscat has historically been influenced by people not native to the Arabian Peninsula. British Parliamentary papers dating back to the 19th century indicate the presence of a significant Hindu Gujarati merchants in the city Indeed, four Hindu temples existed in Muscat ca. 1760. Christianity flourished in Oman (Bēṯ Mazūnāyē "land of the Maganites"; a name deriving from its Sumerian designation) from the late 4th century to early 5th century. Missionary activity by the Assyrians of the Church of the East resulted in a significant Christian population living in the region, with a bishop being attested by 424 AD under the Metropolitan of Fars and Arabia. The rise of Islam saw the Syriac and Arabic-speaking Christian population eventually disappear. It is thought to have been brought back in by the Portuguese in 1507. Protestant missionaries established a hospital in Muscat in the 19th century.