the Persian Gulf under their control and extended their influence as far as Oman, establishing garrisons in Oman to help control the trade routes in the Persian Gulf. In the 3rd century AD, the Sassanids succeeded the Parthians and held the area until the rise of Islam four centuries later.
Arrival of Islam
Omanis were among the first people to come in contact with and accept Islam. The conversion of the Omanis is usually ascribed to Amr ibn al-As, who was sent by Muhammad around 630 AD to invite Jayfar and 'Abd, the joint rulers of Oman at that time, to accept the faith. In submitting to Islam, Oman became an Ibadhi state, ruled by an elected leader, the Imam. During the early years of the Islamic mission, Oman played a major role in the Wars of Apostasy that occurred after the death of Muhammad, and also took part in the great Islamic conquests by land and sea in Iraq, Persia and beyond. Oman's most prominent role in this respect was through its extensive trading and seafaring activities in East Africa and the Far East, particularly during the 19th century, when it propagated Islam to many of East Africa's coastal regions, certain areas of Central Africa, India, Southeast Asia and China. After its submission to Islam, Oman was ruled by Umayyads between 661–750, Abbasids between 750–931, 932–933 and 934–967, Qarmatians between 931–932 and 933–934, Buyids between 967–1053, and the Seljuks of Kirman between 1053–1154.
Portuguese colonization
A decade after Vasco da Gama discovered the seaway to India in 1498, Portuguese explorers arrived in Oman and occupied Muscat for a 140-year period, between 1508 and 1648. In need of an outpost to protect their sea lanes, the Portuguese colonists built up and fortified the city, where remnants of their colonial architectural style still remain.
Rebellious tribes eventually drove out the Portuguese, but were pushed out themselves about a century later, in 1741, by
