26 December 1890
Danieri Basammula-Ekkere Mwanga II, Mukasa beter known as King Mwanga II, was Kabaka of the kingdom of Bungada after the death of his father, Muteesa I in 1884. Upon ascending to the throne, mwanga expelled all Christian missionaries and forced his people to abandon the faith. He saw the spread of the Christian faith as a threat to his power and influence. Those who refused to  comply faced death. His Autocratic rule soon fuelled a rebellion, and he was dethroned and replaced, first with his half-brother, Kiweewa Nnyonyintono, and later his other brother Kabaka Kalema Muguluma. Mwanga then negotiated with the British to back him against his brother in exchange for handing over some of his sovereignty to the British East Africa Company. They signed a treaty on 26 December 1890. The British then backed Mwanga as he took the throne back from Kalema.
References

Beck S.  East Africa, Arabs, and Europeans 1700-1856 from San Beck [online] Available at: www.san.beck.org [Accessed on 20 November 2012]|

Encyclopedia Uganda [online] Available at: www.encyclopedia.com [Accessed on 20 November 2012]