English: Who were some significant individuals or groups Baldwin I, Margrave of Flanders interacted with during his lifetime?
translation: 博杜安一世在有生之年與那個重要的人或團體互動？
translation: 博杜安一世一世一生中與哪些重要人物或團體有過交往？
translation: 博杜安一世在有生之年與多與誰和團體互動？
translation: 博杜安一世有生之年與誰互動？