"Blaggard" Isn't a Swear-Word, Lord Byron.
It is Legitimate Old English for "Someone who Brags Loudly", about for example, Banning People off Websites They have No control over.
And it's in Shakespeare.
Probably.
And so your assumption is that there are no swear words in Shakespeare?...LOL
Not to mention that Shakespeare didn't write in Old English, and that blaggard is not Old English.
Did Chaucer swear? That isn't Old English either, Dude.
Maybe Lou Reed and Donna Reed were brothers.