Eric Liddell.

Eric Henry Liddell. 16 January 1902 – 21 February 1945) was a Scottish athlete, rugby union international player, and missionary.Liddell was the winner of the men's 400 metres at the 1924 Summer Olympics in Paris. Liddell's Olympic training and racing, and the religious convictions that influenced him, are depicted in the Oscar-winning 1981 film Chariots of Fire, in which he is portrayed by fellow Scot Ian Charleson.
I may have thought that he was a little over the top in his refusal to run his final on a Sunday - but what dedication to the faith: what evidence of integrity.
Compare to the Olympics this year, though. 'Let's forget ALL Sunday trading laws!"