Ignatius Sancho
c. 1729 – 14 December 1780, 1768
Sancho has a Wikipedia Entry, an article published in Black History Month 2018, an article at the British Library, and numerous other articles written because he was the first person of color to vote in a British election, and because he has other historical importance. Search turns up dozens, if not hundreds of articles on his importance—far too many to list here.
. There are a few scores at IMSLP. There is no music available at Amazon, but there are several books.
Fortunately, MBC has published a few videos on YouTube!