Why did Edward III pay homage to Philip VI for Guyenne?

Edward III paid homage to Philip VI for the duchy of Guyenne primarily because of the long-standing political obligations established by the Treaty of Paris of 1259. This treaty dictated that the kings of England held their remaining French lands as vassals of the French crown, requiring them to perform homage for the territory.12

After initially protesting Philip VI's accession to the French throne and asserting his own claim to the crown, Edward III withdrew his challenge following Philip's military success against Flemish rebels. Consequently, in June 1329, Edward performed simple homage for Guyenne at Amiens to maintain his hold on the duchy. This relationship remained a source of significant friction, as the French king's suzerainty allowed for frequent interference in the duchy's affairs, and Philip VI later demanded more stringent liege homage, which Edward eventually provided in 1331. These tensions over sovereignty and feudal obligations were fundamental causes that eventually led to the outbreak of the Hundred Years’ War in 1337.312