Muscat (Arabic: مسقط‎, Masqaṭ pronounced [ˈmasqatˤ]) is the capital of Oman. It is also the seat of government and largest city in the Governorate of Muscat. According to the National Centre for Statistics and Information (NCSI), the total population of Muscat Governorate reached 1.56 million as of September 2015. The metropolitan area spans approximately 3,500 km² (1,400 sq mi) and includes six provinces called wilayats. Known since the early 1st century CE as an important trading port between the west and the east, Muscat was ruled by various indigenous tribes as well as foreign powers such as the Persians, Portuguese Empire and the Ottoman Empire at various points in its history. A regional military power in the 18th century, Muscat's influence extended as far as East Africa and Zanzibar. As an important port-town in the Gulf of Oman, Muscat attracted foreign tradesmen and settlers such as the Persians and the Balochis.