"Oman"
After Persians: from the Wikipedia
"Zanzibar was settled by Persian immigrants from Shiraz, and the name Zanzibar probably derives from the Persian Zangi-bar meaning "Coast of the Blacks". However, the name could also have been derived from the Arabic Zayn Z'al Barr, meaning "Fair is this land". The island was later controlled by Portugal for a period starting in 1503.
In 1698 Zanzibar became part of the overseas holdings of Oman, falling under the control of the Sultan of Oman. On April 6, 1861, following a struggle over the accession to the position of Sultan of Oman, Zanzibar and Oman were divided into two separate principalities. Sayyid Majid bin Said Al-Busaid (1834/5-1870), son of Sayyid Said bin Sultan Al-Busaid, became Sultan of Zanzibar, while his brother Sayyid Turki bin Said Al-Busaid (1832-1888) became Sultan of Oman. During this period, the Sultan of Zanzibar also controlled a substantial portion of the east African coast, known as Zanj, including Mombasa, which was taken from Oman in 1840 and remained part of the state of Zanzibar until 1963 when it was ceded to the newly independent state of Kenya."
http://en.wikipedia.org/wiki/Zanzibar