The example in this particular case is George Boleyn
Okay. But in all fairness those allegations - which according to wiki was about the men accused with Boleyn in general - were made 20 years ago by a heterosexual historian. They were widely debunked as inaccurate (the men weren't all charged with sodomy) and never taken seriously by academics.
They've recently been revived by a historical novelist and a TV series.
The sum of the allegations is that among historians there aren't any. Among historical novelists and screenplay writers, maybe, but they're allowed to take license and it doesn't necessarily indicate some gay trawl through history for icons.
On which subject, it's worth remembering that in terms of history, queer history is generally not interested in finding famous gay people. It's interested in the historical experience of sexuality, particularly in reference to homosexuality - see the superb book (the name escape's me) on Victorian women living together. Generally it comes from not necessarily gay specialists in a figure based on the sources.
The examples I know best are literary but the suggestions about Tennyson are pretty obvious, those about Shakespeare though are very much based in the text. Queer critics aren't actually that interested in whether Shakespeare's gay or not. They're interested in Antonio and Bassanio, Mercutio and Romeo, queer readings of a Winter's Tale, or, (in an actually very interesting essay - if it's what I think it is) things like 'Othello's Penis Or Islam in the Closet'.