Guy succeeded his father as earl in 1298, distinguishing himself in that same year by participating in the Battle of Falkirk, the first major battle in the war for Scottish Independence that saw the English defeat the Scots under William Wallace. Guy had been knighted two years earlier by King Edward I.
In 1299 he helped negotiate the treaty that was to wed Prince Edward Caernarvon (later Edward II) to the French Isabella. He was made High Sheriff of Worcestershire, and was given John Balliol's Barnard Castle after Balliol's attempt to become King of Scotland failed.
Before Edward I's death in 1307, his son's friend Piers Gaveston had been exiled. Guy was one of the men responsible for seeing that the exile remained permanent. Edward II brought Gaveston back and made him Earl of Cornwall. Guy was the only earl who did not support the king's decision, and when Gaveston was exiled again and again brought back by Edward, Guy was the only objector. (All of that business has been discussed many times in this blog. The illustration is from a later account, with Guy standing over Gaveston's body.)
Guy, Earl of Warwick was one of the most powerful and respected men in England. Edward I left supervision of his son to Guy. The Vita Edwardi Secundi ("Life of Edward II") mentions that "Other earls did many things only after taking his opinion: in wisdom and council he had no peer."
He was also interested in education (or maybe just in collecting books?). He had a large library of saints' lives, romances about Alexander the Great, and stories of King Arthur. In his lifetime he donated 42 books to Bordesley Abbey (now only a ruin), where he was buried; his family was among its benefactors.
His namesake, Guy of Warwick, was a popular figure in English romance and worth taking a look at, which we shall do tomorrow.