Napoleon's brother-in-law, Joachim Murat (March 25, 1767 – October 13, 1815), a Marshal of France, usurped the grand mastership of the Order of Saint Joachim in 1806 when he was made the Grand Duke of the newly created "Duchy of Berg and Cleves". During his term as Grand Duke of Berg and Cleves (March 15, 1806 to August 1, 1808 when he left to become King of Naples) Joachim Murat declared himself the Grand Master of The Order of Saint Joachim, and expanded the Order to include members of the French Legion of Honour. His authority was never recognized by the rest of the Order in exile.