Baldwin of Ibelin year, the king betrothed his younger half-sister Isabella of Jerusalem, Balian's stepdaughter, to Humphrey IV of Toron, to further reduce the Ibelins' influence. In 1183 he supported Raymond against Guy, who was by now regent for the ailing Baldwin IV. Lord Baldwin was among the barons who advised the king to crown Sibylla's son Baldwin V in 1183, while Baldwin IV was still alive; this was an attempt to prevent Guy from succeeding as king. Baldwin V became sole king while still a child in 1185, and when the young king died in 1186, Sibylla was crowned queen with Guy
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.