John Nelson (convert)
From Infogalactic: the planetary knowledge core
John Nelson was one of the earliest known Englishman to convert to Islam. The source of this information comes from the book, The Voyage made to Tripoli (1583) by Thomas Saunders:
"The evidence for John Nelson's conversion derives from an account The Voyage made to Tripoli (1583) by Thomas Saunders, cited in Matar (1998)." [1]