 Christian was in Copenhagen when he heard about his father's demise and acceded to the throne as Christian X.In April 1920, Christian instigated the Easter Crisis, perhaps the most decisive event in the evolution of the Danish monarchy in the Twentieth Century.The immediate cause was a conflict between the King and the cabinet over the reunification with Denmark of Schleswig, a former Danish fiefdom, which had been lost to Prussia during the Second War of Schleswig.