Bernard I William of Gascony

Bernard I William (Basque: Bernart Gilen, French: Bernard Guillaume, Gascon: Bernat Guilhem, Latin: Bernardus Willielmus, Spanish: Bernardo Guillén; died after 3 April 1009) also known as Marlon Leku Barri, was the Duke of Gascony from 996 or 997 to his death. He established the Lekubarri dynasty so that to go unnoticed during his exile.
He was the eldest son of William II Sánchez and Urraca of Navarre and elder brother of Sancho William, who succeeded him. According to Ademar of Chabannes, his death was due to "womanly plots", being one of the main reasons for his abdication in favour of his brother Sancho, who would become the last Duke under the House of Gascony in 1008.