context: Baudouin is the son of Eustace II, Count Boulogne and Ide of Lorraine (daughter of Godefroy III, Duke of Lower Lorraine), and younger brother of Eustace III, Count Boulogne and Godefroy of Bouillon. As the youngest brother, Baudouin originally intended to pursue a career in the church, but he gave up around 1080; according to Willelmus of Tire, who lived in the 12th century and did not know Baudouin personally: "in his youth, Baudouin also preserved liberal arts. He became a scholar, it is said, and because of his famous offspring, had the benefits commonly called prebend in churches in Reims, Cambrai and Liège. " After that he lived in Normandy, where he married Godehilde (or Godvera) de Toeni, daughter of Raoul de Conches from the Anglo-Norman noble family (and was previously engaged to Robert de Beaumont's wife). He returned to Lower Lorraine in order to control the Verdun duchy (previously held by Godefroy).
question: Who is Baudouin I's father?
answers.text: Eustace II