He became the Right Honourable Richard Wesley, 1st Baron Mornington, and spent a considerable sum of money improving and maintaining the gardens of 600 Irish acres.

[1] The castle was occupied in the early years of the 19th century by Roger O'Connor, who acquired it from Burrowes on a permanently renewable lease.

[1] O'Connor, a passionate Irish nationalist, asserted that he had acquired it as "a suitable residence in which to entertain Napoleon" after the defeat of Britain.

[7] In 1817 O'Connor was accused of having plotted with his estate manager and labourers to rob a mail coach, during which a guard was shot and killed.

By 1841, The Irish Penny Journal noted that "nothing but the outer walls remain, and the interior space, once formed into ample halls and chambers, has been converted into a flower garden".