Malvasia companies occasionally use the name "Malvasia" or "Malvazia" for non-vintage Madeiras, especially those primarily marketed to Portuguese-speaking countries. English historical tradition associates Malmsey wine with the death of George Plantagenet, 1st Duke of Clarence, brother of King Edward IV of England. Following his conviction for treason, he was "privately executed" at the Tower on 18 February 1478, by tradition in the Bowyer Tower, and soon after the event, the rumour gained ground that he was drowned in a butt of Malmsey wine. Malvasia Malvasia (, also known as Malvazia) is a group of wine grape varieties grown historically in the
Sack (wine) as "Rumneys" and "Sacks". This period in time coincides with the planting of vines in the Canaries, after the Spanish all but exterminated the indigenous Guanches in the 1490s. Málaga, formerly in the Kingdom of Granada, also took to using the name sack for its wines, which were previously sold as “Garnacha”. This wine was similar to another wine known as 'malmsey', made from Malvasia grapes. William Shakespeare's character Sir John Falstaff, introduced in 1597, was fond of sack, and sometimes refers specifically to Sherris sack. William Shakespeare's minor character Sly, a drunkard and an object of a jest, declares