Zanzibar Revolution
The Sultanate of Zanzibar – which was a British protectorate until 1963 – used a red flag during its reign over the island. The last sultan was overthrown in the Zanzibar Revolution on 12 January 1964, and the Afro-Shirazi Party – the ruling political party of the newly formed People's Republic of Zanzibar and Pemba – adopted a national flag the next month that was inspired by its own party flag. This consisted of a tricolour with three horizontal blue, black and green bands.