William, the duke of Normandy: 1048 to 1060

Count Hoel of Cornouailles is a popular figure, a worthy counter to Conan. By backing Hoel, you could achieve a lever on the feelings of many Bretons favorable to Normandy.

But, you have miscalculated in ignoring that peace conference. Believe it or not, this is a critical oversight on your part, and requires that coin toss of fate again:
Heads you win.
Tails you lose.