Zanzibar: Rulers: 1856-1964

Ruling House: Āl Bū Saʿīd (آل بو سعيد)
Sulṭān Zanjabār (سلطان زنجبار) [1]
2 Nov 1856 - 7 Oct 1870	Mājid bin Saʿīd (ماجد بن سعيد)
7 Oct 1870 - 26 (or 27) Mar 1888	Barghash bin Saʿīd (برغش بن سعيد)
27 Mar 1888 - 13 Feb 1890	Khalīfah bin Saʿīd (خليفة بن سعيد) [2]
13 Feb 1890 - 5 Mar 1893	ʿAlī bin Saʿīd (علي بن سعيد)
5 Mar 1893 - 25 Aug 1896	Ḥāmad bin Thuwaynī (حمد بن ثويني)
25 Aug 1896 - 27 Aug 1896	Khālid bin Barghash (خالد بن برغش) [3]
27 Aug 1896 - 18 Jul 1902	Ḥammūd bin Muḥammad (حمود بن محمد)
18 Jul 1902 - 9 Dec 1911	ʿAlī bin Ḥammūd (علي بن حمود)
9 Dec 1911 - 9 Oct 1960	Khalīfah bin Ḥārib (خليفة بن حارب)
9 Oct 1960 - 1 Jul 1963	ʿAbd Allāh bin Khalīfah (عبد الله بن خليفة)
1 Jul 1963 - 12 Jan 1964	Jamshīd bin ʿAbd Allāh (جمشيد بن عبد الله)

The style Sulṭān was initially used only in international relations. Other honorific titles: Ḥāmī (حامي), Sayyid (سيد), the latter is normally prepended to personal name.
Barghash died around the midnight of 26/27 Mar 1888 and Khalīfah was installed on 27 Mar 1888.
Following the death of Ḥāmad, Khālid seized the palace and proclaimed himself ruler, but was besieged by the British armed forces and was compelled to take refuge in a foreign consulate.