A United Kingdom is a 2016 biographical romantic drama film directed by Amma Asante and written by Guy Hibbert, based on the true-life romance of Seretse Khama, heir to the throne of the Bangwato Tribe in Serowe – one of many tribes found in then Bechuanaland Protectorate – with his wife Ruth Williams Khama. David Oyelowo and Rosamund Pike portray Seretse and Ruth, respectively.