Yes. Actual English Politics in the Fifteenth Century Was Weirder than Anything in "Game of Thrones". Why Do You Ask?
"[Richard Duke of] York ran into severe difficulty in early 1456.... His authority was almost visibly ebbing away. In public he was scorned: a display of five severed dogs’ heads was erected on Fleet Street in London in September, with each dog’s dead mouth bearing a satirical poem against York, 'that man that all men hate'...”