Did the Marquess of Queensbury do anything of note other than those boxing rules?
He most certainly did.
His son was Lord Alfred “Bosie” Douglas who had an affair with Oscar Wilde . When the Marquess found out about the affair he accused Oscar of being a somdomite.
Wilde sued for libel and this lead to his jailing and excile from society .
The 1997 movie Wilde will give you a very good account of these events . It also has a great performance of Wilde by a English actor/funnyman Stephen Fry .
He was also a noted advocate of atheism.