Among those who continued to reside in Imerina were Jean Laborde, an entrepreneur who developed munitions and other industries on behalf of the monarchy, and Joseph-François Lambert, a French adventurer and slave trader, with whom then-Prince Radama II signed a controversial trade agreement termed the Lambert Charter. Succeeding his mother, Radama II (1861–63) attempted to relax the queen's stringent policies, but was overthrown two years later by Prime Minister Rainivoninahitriniony (1852–1865) and an alliance of "Andriana" (noble) and "Hova" (commoner) courtiers, who sought to end the absolute power of the monarch.