By 1500 AD, they were assimilated into Bantu speaking cultures south of Mount Elgon, the Nile river, and Lake Kyoga. According to oral tradition and archeological studies, the Empire of Kitara covered an important part of the great lakes area, from the northern lakes Albert and Kyoga to the southern lakes Victoria and Tanganyika. Bunyoro-Kitara is claimed as the antecedent of the Toro, Ankole, Buganda and Busoga kingdoms. Some Luo invaded the area of Bunyoro and assimilated with the Bantu society there, establishing the Babiito dynasty of the current Omukama (ruler) of Bunyoro-Kitara. Arab traders moved into the land from the Indian Ocean coast of East Africa in the 1830s for trade and commerce. In the late 1860s, Bunyoro in Mid-Western Uganda found itself threatened from the north by Egyptian-sponsored agents. Unlike the Arab traders from the East African coast who sought trade, these agents were promoting foreign conquest. In 1869, Khedive Ismail Pasha of Egypt, seeking to annex the territories north of the borders of Lake Victoria and east of Lake Albert and "south of Gondokoro," sent a British explorer, Samuel Baker, on a military expedition to the frontiers of Northern Uganda, with the objective of suppressing the slave-trade there and opening the way to commerce and "civilization." The Banyoro resisted Baker, who had to fight a desperate battle to secure his retreat. Baker regarded the resistance as an act of treachery, and he denounced the Banyoro in a book (Ismailia – A Narrative Of The Expedition To Central Africa For The Suppression Of Slave Trade, Organised By Ismail, Khadive Of Egypt (1874)) that was widely read in Britain. Later, the British arrived in Uganda with a predisposition against the kingdom of Bunyoro and sided with the kingdom of Buganda. This would eventually cost Bunyoro half of its territory, which was given to Buganda as a reward from the British. Two of the numerous "lost counties" were restored to Bunyoro after independence. In the 1860s, while Arabs sought influence from the north, British explorers searching for the source of the Nile arrived in Uganda. They were followed by British Anglican missionaries who arrived in the kingdom of Buganda in 1877 and French Catholic missionaries in 1879. This situation gave rise to the death of the Uganda Martyrs in 1885—after the conversion of Muteesa I and much of his court, and the succession of his anti-Christian son Mwanga. The British