Tricolour (flag) orange-white-blue design of the Prince's Flag ("Prinsenvlag", predecessor of the flags of the Netherlands and Luxembourg), used from 1579 by William I of Orange-Nassau in the Eighty Years' War, establishing the independence of the Dutch Republic from the Spanish Empire. Though not the first tricolour flag, one of the most famous, known as "Le Tricolore", is the blue, white and red (whence also called "Le Bleu-Blanc-Rouge") flag of France adopted in the French Revolution. With the formation of French client republics after 1795, the revolutionary tricolour was exported and adopted more widely in Europe, by the Republic of Alba 1796
Flag of Zanzibar yellow cloves was added to the flag. On 12 January 1964, John Okello overthrew the Sultan of Zanzibar and adopted a black-yellow-blue tricolour as the flag of the People's Republic of Zanzibar and Pemba. On 29 January, the country's flag was changed to a blue-black-green tricolour with a thin white stripe at the hoist. This design, which was based on the flag of the Afro-Shirazi Party, was the longest-lived of the post-independence flags and eventually formed the basis for the current flag. On 26 April 1964, Zanzibar united with Tanganyika to form the new country of Tanzania and Zanzibar's old