Queen Eleanor and her sons were conspiring against Henry II.

So he made friends with them.

The palace on the island in the Seine was an asylum where John and Richard might plot against their father.

And when a third Crusade was planned, 1189, it had as leaders Philip Augustus of France, Richard I., who had just succeeded his father, Henry II., as King of England, and Barbarossa (Frederick I.), the great Emperor of Germany.

Before the Holy Land was reached the wise and crafty Philip Augustus and the fiery Richard had quarrelled.
Philip had been carefully observing these two brothers who were successively to wear the crown of England.