How did Richard I work with Philip II of France against Henry II?

Philip II of France skillfully exploited the strained relationship between Henry II and his son, Richard I, to weaken the English king's position. By fostering this estrangement, Philip encouraged Richard to turn against his father; notably, Richard voluntarily performed homage to Philip at Bonmoulins in November 1188.1

This alliance pressured Henry II into the Treaty of Azay-le-Rideau in July 1189, which forced the English king to make significant territorial concessions to Philip shortly before Henry’s death. While Richard and Philip later joined the Third Crusade, their cooperation was characterized by mutual distrust and conflicting political agendas, as Philip’s primary interest remained the expansion of his own domains at the expense of the Angevin empire.12