The Kingdom of Ormus (also known as Ohrmuzd, Hormuz, and Ohrmazd; Portuguese Ormuz) was a 10th- to 17th-century kingdom located within the Persian Gulf and extending as far as the Strait of Hormuz. The Kingdom was established by Arab princes in the 10th century who in 1262 came under the suzerainty of Persia, before becoming a client state of the Portuguese Empire.
The kingdom received its name from the fortified port city which served as its capital. It was one of the most important ports in the Middle East at the time as it controlled seaway trading routes through the Persian Gulf to India and East Africa. This port was probably located on Hormuz Island, which is located near the modern city of Bandar-e Abbas.
The Strait of Hormuz is a narrow, strategically important waterway between the Gulf of Oman in the southeast and the Persian Gulf in the southwest. On the north coast is Iran and on the south coast is the United Arab Emirates and Musandam, an exclave of Oman.
The city-state of Ormus dates back to the 13th century when it controlled the slave market from Africa and Arabia to Khorasan in Persia. At its zenith in 13th to 14th century, Ormus (or Ormuz) was a powerful naval state with a large and active trading fleet and a powerful navy. Petrashevsky reports the size of the fleet to be up to 500 fighting ships. These ships were not armed with cannons.