Thomas Dun was a real-life highwayman in England circa the year 1100. He was no Robin Hood. He disguised himself. He robbed, he murdered. His victims piled up.
For the most part Dun’s story, from Crime Must Pay the Penalty #4 (1948), describes Dun's criminal career in much the same fashion as the biographical information I have read online. The main difference is in the manner of Dun’s ultimate fate. History tells us that Dun was executed, without trial, in one of the most hideous ways the human mind can think of. Even a crime comic book dared not show something that gruesome. If you’re up to it, you can read about Dun, including his true demise here.
The Grand Comics Database gives Ken Battefield credit for the artwork.