Question: Ruth Williams Khama, Lady Khama, was the wife of the first President of Botswana, in office from 1966 to 1980, his name? 
Sentence (from "Ruth Williams Khama"): Ruth Williams Khama, Lady Khama (9 December 1923 – 22 May 2002) was the wife of Botswana's first president Sir Seretse Khama, the Paramount Chief of its Bamangwato tribe.
Relevant evidence: Yes