 In 637, Julfar (in the area of today's Ras Al Khaimah) was an important port that was used as a staging post for the Islamic invasion of the Sasanian Empire.The area of the Al Ain/Buraimi Oasis was known as Tu'am and was an important trading post for camel routes between the coast and the Arabian interior.The earliest Christian site in the UAE was first discovered in the 1990s, an extensive monastic complex on what is now known as Sir Bani Yas Island and which dates back to the 7th century.