Edward Fitzgerald, Duke of Leinster was 
Ireland's premier peer of the realm. In the early twentieth century, he unexpectedly inherited the dukedom following the deaths of his two older brothers. An addicted gambler, he had already signed away his rights to the family's ancestral seat, 
Carton House[?], near 
Maynooth[?], Co. 
Kildare[?] in 
Ireland, never expecting that he would actually inherit the property and his title. He moved to live in England. 
It was revealed in 2003 that, though a close friend of King Edward VIII he was the third lover of the King's mistress, Wallis Simpson during the Abdication Crisis in 1936
 
All Wikipedia text 
is available under the 
terms of the GNU Free Documentation License