Uganda Journal Vol 1 No 1 - Lieutenant James Barker Emery was Civil Governor of Mombasa during the temporary British Protectorate of 1824-1826 …….. The British Government withdrew from the Protectorate in 1826 and Emery was invalided to England. …… in the course of his dealings with the Arab and Swahili population of the coast he learnt that 'a very large lake exists in the interior, its banks thickly studded with buildings, lying nearly due west of Mombasa.' The information was obtained nearly 30 years before Rebmann and Erhardt published the famous 'slug map' which led to the explorations of Burton and Speke

See Sir John Gray, 'The British in Mombasa 1824-1826', 1957

1881 England Census for Kingston, Surrey, he gives his address as Mombaza, Adelaide St, and below him is William Spence, Pemba, Adelaide St. Emery is a widower