Pelio II was born to his father, Emir Pelio of Navarra. When he was 3 years old, his father died and he inherited his lands.
Unfortunately, he lost most of them to various holy wars, and was left with just the county of Rennes, in Brittany.
During his childhood, he discovered that his regent was embezzling his money, so he knocked the regent off the balcony and instated his mother as regent. She also started embezzling money, but was a bit more subtle about it.
As an adult, he was vassalized in another holy war by the duke of Normandy.
But he decided not to give up. He raised money and vaged holy war upon the norse pagans that plagued Brittany along with his former liege. He did not win the war, but only because the king of france waged the same war and won it instead. And then the king of France decided to give Pelio II the Duchy of Brittany.
Pelio was overjoyed. But he did not stop there. Now that he had some more lands and subjects, he warred against the norse pagans and the muslims of Hispania and England that claimed provinces in Brittany. And even against Aquitaine, when France split in three due to Gavelkind succession.
He joined the Dominican order, only to steal a Nail of the True Cross from them. He managed that, but was caught in the act by Cuddles, the lunatic bear, and expelled from the order.
He then joined the Benedictine order, and stayed in it until his death. He did break his vows of celibacy though, and became a hedonist instead.
When his first wife died, he married another, a young one. As it turned out, his first son died, so it was all good when a second was born.
Through warring, and some gifts from the kings of France, Pelio II became the arch-duke (duke of Brittany, Penthrive, and Upper Brittany) of all of Brittany. He also had 2 counties in Normandy and a count vassal in Corsica.
For some reason, kings of France really wanted him to become a commander, in spite of his terrible personal skill. But he preferred being their Chancellor.
He died fat and happy at the age of 77, and his son succeeded him on the throne at the age of 18.