It's possible there were two sisters to Middleton and leander
Starr Jameson. Catharine Jameson (1840-/) and Elizabeth Jameson
(1848-1941)
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Cecil John Rhodes was nursed through his last illness by a
friend, Leander Starr Jameson. Jameson was neither black, nor
female. There is no actual evidence that he had a female of any
race nursing him through his health issues.
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He wrote it about Dr Leander Starr Jameson who led a defeated
rebellion against the Boers. This turned out to be a disaster as it
led to the 2nd Boer war, but Jameson was portrayed as a national
hero and the defeat as a victory in the British press.