Piers Gaveston was born about 1284, son of a Gascon knight, Arnaud Gaveston. Although later critics complained that Piers had been "raised up from nothing," his family was not unknown. Arnaud's tomb is in Winchester Cathedral, and the carving shows his legs crossed, indicating that he went on Crusade.
We do not know details about Piers' early life, but Edward I considered it appropriate to appoint him to the prince's household. (The illustration shows Ian McKellen as Edward and James Laurenson as Gaveston in the 1970 Edward II.) Later reports suggest that he was very accomplished and clever, but that was not always a benefit under the circumstances:
The baronage of England, moreover, did not take kindly to a royal favourite who could unhorse them in the lists, and who could also pierce the armour of their dignity with his barbed Gascon wit. It is difficult today to understand why the tough barons of fourteenth-century England were so incensed at the nicknames invented for them, and it is equally difficult to appreciate the Gascon's wit. [Edward II, Harold Hutchinson, p.57]
Sticks and stones might have broken their bones, but names apparently really rankled the rest of the barons and courtiers. Thomas of Lancaster, the king's cousin, was called "a fiddler"; the Earl of Pembroke, Aymer de Valence, a respected member of Edward I's court, was nicknamed "Joseph the Jew"; Warwick was called the "black dog of Arden"; Warwick and Gaveston's relationship would climax in a deadly manner.
An annoying member of the court could be ignored under some circumstances, but this one was an especial favorite of the new king. That relationship allowed him to abuse his fellow lords with impunity—for a time. As it happens, the barons were able to deal with Gaveston in part because of the king's own coronation oath, which included a phrase that was ambiguous enough it could be interpreted in their favor. How that worked out, and other reasons why they were so opposed to Gaveston, are a story for next time.