He was sold to Stanley by an Arab merchant in Zanzibar. His real name was Ndugu Mhali,but because Stanley didn't like the name he christened him Kalulu.
Between 1872 to 1873, Kalulu accompanied Stanley around Europe and America, and during that time posed for a wax model which was later installed at Madame Tussaud’s museum in London .
Stanley briefly enrolled him at a school in Wandsworth, South West London, where the headmaster later noted that he was " clever and progressing in English."
After the death of Dr David Livingstone in Zambia in 1874 , Stanley who was keen to carry on with Livingstone's exploration work, withdrew Kalulu from school and the two returned to Africa.
In 1877, Stanley while using Kalulu as his servant, embarked on an expedition in the Congo to find the Source of river Nile.
Unfortunately during this trip Kalulu died in a tragic accident after his canoe plunged hundreds of feet down a water fall on the Congo River. The waterfall was later named 'Kalulu Falls' in his honour....Blacksregion.com
Credit: Smithsonian Institution Archives and Odhiambo Levin Opiyo