After his father 's death , Lambert III became a pretender to the County of Nantes seat .
Lambert was the son of Lambert II of Nantes , at whose death in 851 , the administration of the region fell effectively to the Bretons .
After Lambert 's father 's death Lambert II of Nantes     became a pretender to the County of Nantes seat .
Lambert was the son of Lambert II of Nantes , at whose death in 851 , the administration of the region fell effectively to the Bretons .