[6] He inherited parts of his father's estates in Ireland in 1823, when he reached the age of majority.

[3] Wilson, who in 1842 assumed the surname of FitzPatrick by Royal Licence, was appointed High Sheriff of Queen's County in 1836.

He was then elected to the House of Commons for Queen's County in 1837, a seat he represented until 1841, and again from 1847 to 1852 and from 1865 to 1869.

[3] In 1869, he was raised to the peerage as Baron Castletown, of Upper Ossory, reviving an ancient title that had belonged to the FitzPatricks around 1500.

[4] He died in 1883, aged 71, just four months after the death of his only sister, Lady Lyvedon.