Downpatrick (UK Parliament constituency)  Downpatrick was a United Kingdom Parliament constituency, in Ireland, returning one MP. It was an original constituency represented in Parliament when the Union of Great Britain and Ireland took effect on 1 January 1801. This constituency was the Parliamentary borough of Downpatrick in County Down. Supplemental notes  Ker resigned by accepting the office of Steward of the Chiltern Hundreds, causing a by-election. Hardinge succeeded to the peerage, becoming 2nd Viscount Hardinge and causing a by-election. Ker resigned, causing a by-election.