Not too sure ...and you may have to do a bit more research but ...
it could have been Arthur Wellesley, 1st Duke of Wellington,and his brother Richard Colley Wesley, later Wellesley, 1st Marquess Wellesley.. both born in Ireland. But I cannot find any reference for the Ist Duke . http://en.wikipedia.org/wiki/Order_of_the_Lion _and_the_Sun