Conan was made Duke of Britanny under Henry's lordship, and Nantes was given up into his hands.

Geoffrey, whose over-lord the young king had been, sought to rule Britanny as a dependent of Philip, and his plots in Paris with the French king were only ended by his death in 1185.

The island enjoyed a fair fame for its climate, its healthfulness, its pasturage, its fisheries; English chroniclers dwelt on "the far-famed harbour of Dublin, the rival of our London in commerce," and told of ships of merchandise that sailed from Britanny to Irish ports, and of the busy wine trade with Poitou.