Today is the 535th anniversary of the execution at the age of twenty eight in the Tower of London of George Duke of Clarence following his conviction for treason in a court presided over by his brother King Edward IV. Such appears to have been the stage management of this trial that it was deemed necessary to destroy the official record of it, and we are dependent upon reports from the Croyland chronicler for what we know of it. The Duke was buried with his wife, who had died in 1476, at Tewkesbury abbey. Clarence's downfall may well be seen as the begining of the implosion of the House of York that culminated in Bosworth and the destruction of the family.
Michael Hicks, who has written a typically balanced and well researched biography of the Duke in False Fleeting Perjur'd: George Duke of Clarence 1449-1478, also wrote the Oxford DNB life of Duke George which can be read here.There is another online life of Clarence here which contains other biographical links. There is an online piece about the Duke's downfall, written from a Ricardian standpoint, here, which contains additional interesting information.
George, Duke of Clarence
A detail from a late sixteenth or early seventeenth century painting from a series of the Constables of Queenborough Castle in Kent. It may derive from a lost contemporary portrait of the Duke.
The story of Clarence being drowned in a butt of malmsey is nearly contemporary with his death, and his daughter, Bl.Margaret Pole, wore a small barrel on a bracelet, presumably as a reminder of her father's fate. The best explanation I have seen is that he was drowned in a bath tub made out of a vat which had held malmsey - perhaps King Edward recoiled from literally spilling his brother's blood, and opted for drowning as a means of execution.