John Waller was an MP for Limerick in the Irish House of Commons between 1790 and 1801 and subsequently MP for Limerick in the UK House of Commons from 1801 to 1802.
Waller was educated at Harrow 1775–6; and matriculated from Trinity, Dublin 17 Apr.
Though he was known as an opponent of the Act of Union he was personally friendly with the main supporter of the Act, Lord Clare and the administration in Dublin Castle believed he was of their way of thinking.
He declined to stand in 1802 and the seat was taken by his brother-in-law Charles Silver Oliver.
[3] It's possible Waller was a prisoner of war in Verdun as he was a captain in the 88th Foot as his own death notice mentioned.