White Queen In Africa. Lady Ruth (Williams) Khama Bamangwato come rare films of Ruth Williams, one-time London typist, now queen Ruth Khama ruling over 100,000 subjects with her native husband, King Seretse Khama. Seretse Khama chief in waiting of the powerful Banargwato tribe. Seretse Khama was the first President of the state of Botswana.