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 I, Latin Emperor since the 1186 treaty. Baldwin V thereupon ruled as Baldwin VIII of Flanders by right of marriage. When Countess Margaret I died in 1194, Flanders descended to her eldest son Baldwin, who ruled as Baldwin IX, Count of Flanders. In 1186, the younger Baldwin had married Marie, daughter of Henry I, Count of Champagne, and Marie of France. The chronicler Gislebert describes Baldwin as being infatuated with his young bride, who nevertheless preferred prayer to the marital bed. Immediately after this arrangement, the count of Hainaut's son Baldwin, thirteen years old, received as wife Marie, the count of Champagne's sister,