Prince Leopold of Saxe-Cobourg, uncle of the future Queen Victoria, was made king of newly-independent Belgium. To counter the fact that he was close to the British royal family, it was agreed that he would marry Louis-Philippe’s daughter Louise.

See Munro Price, The Perilous Crown: France Between Revolutions, 1814-1848 (London: Macmillan, 2007), pp. 222.