Baldwin I, Latin Emperor of the Holy Land: her brother Henry II of Champagne had been King of Jerusalem in the 1190s (leaving a widow and two daughters who needed help to keep and regain their territories in Palestine). Marie's uncles Richard I of England and Philip II of France had just been on the Third Crusade. Baldwin's own family had also been involved in the defence of Jerusalem: his uncle Philip had died on Crusade. Baldwin's maternal grandmother was great-aunt of Queen Isabella I of Jerusalem and the Counts of Flanders had tried to help Jerusalem relatives in their struggle. Baldwin wanted to
Baldwin of Luxembourg good terms with the Capetian court of France. He was only twenty-two years of age when elected Archbishop of Trier in 1307. In 1308, he was consecrated bishop by Pope Clement V in Poitiers. He quickly became one of the most influential princes in Germany, influencing the election that year of his brother Henry VII as King and Holy Roman Emperor. From 1310 to 1313, Baldwin accompanied Henry in Italy, where he was crowned emperor in Rome on 29 June 1312. In the election which followed Henry's early death the next year, Baldwin lent his support to Louis the Bavarian.