Ernst August married secondly, civilly in Monaco on 23 January 1999, Princess Caroline of Monaco, who was at the time expecting the birth of their child, Princess Alexandra (born 20 July 1999). As he was descended from King George II of Great Britain in the male line, Ernst August sought and received permission to marry pursuant to the British Royal Marriages Act 1772, which would not be repealed until the Succession to the Crown Act 2013 took effect on 26 March 2015. Similarly the Monégasque court officially notified the government of France of Caroline's marriage to Ernst August, receiving assurance that there was no objection in compliance with the (since defunct) Franco-Monegasque Treaty of 1918. Moreover, in order for Caroline to retain her claim to the throne of Monaco and to transmit succession rights to future offspring, the couple were also obliged to obtain the approval of yet a third nation, in the form of official consent to the marriage of Caroline's father, Prince Rainier III as the sovereign of Monaco.