Initially, Henry put his hopes in fathering another son. William and Matilda's mother—Matilda of Scotland—had died in 1118, and so Henry took a new wife, Adeliza of Louvain. Henry and Adeliza did not conceive any children, and the future of the dynasty appeared at risk. Henry may have begun to look among his nephews for a possible heir. He may have considered his sister Adela's son Stephen of Blois as a possible option and, perhaps in preparation for this, he arranged a beneficial marriage for Stephen to Empress Matilda's wealthy maternal cousin Countess Matilda I of Boulogne. Count Theobald IV of Blois, another nephew and close ally, possibly also felt that he was in favour with Henry. William Clito, the only son of Robert Curthose, was King Louis VI of France's preferred choice, but William was in open rebellion against Henry and was therefore unsuitable. Henry might have also considered his own illegitimate son, Robert of Gloucester, as a possible candidate, but English tradition and custom would have looked unfavourably on this. Henry's plans shifted when Empress Matilda's husband, Emperor Henry, died in 1125.