 Negotiations over the marriage contract took several months , with Charlotte insisting that she not be required to leave Britain . The diplomats had no desire to see the two thrones united , and so the agreement stated that Britain would go to the couple 's oldest son , while the second son would inherit the Netherlands ; if there was only one son , the Netherlands would pass to the German branch of the House of Orange . On 10 June 1814 , Charlotte signed the marriage contract . Charlotte had become besotted with a Prussian prince whose identity is uncertain ; according to Charles Greville , it was Prince Augustus , although historian Arthur Aspinall disagreed , thinking that her love interest was the younger Prince Frederick . At a party at the Pulteney Hotel in London , Charlotte met a Lieutenant @-@ General in the Russian cavalry , Prince Leopold of Saxe @-@ Coburg @-@ Saalfeld . The Princess invited Leopold to call on her , an invitation he took up , remaining for three quarters of an hour , and writing a letter to the Prince Regent apologising for any indiscretion . This letter impressed George very much , although he did not consider the impoverished Leopold as a possible suitor for his daughter 's hand . 
