question: When did the Acts of Union 1800, which was represented in Parliament by such unions as New Ross, take effect?
answer: 1 January 1801
context: Title: Acts of Union 1800
  Passage: The Acts of Union 1800 (sometimes erroneously referred to as a single Act of Union 1801) united the Kingdom of Great Britain and the Kingdom of Ireland (previously in personal union) to create the United Kingdom of Great Britain and Ireland with effect from 1 January 1801.  The "Irish" Act (the Act of the (Old) Irish Parliament) however has since been repealed in the Republic of Ireland some time after Independence.
  Title: Parliament of Great Britain
  Passage: The Parliament of Great Britain was formed in 1707 following the ratification of the Acts of Union by both the Parliament of England and the Parliament of Scotland.  The Acts created a new unified Kingdom of Great Britain and dissolved the separate English and Scottish parliaments in favour of a single parliament, located in the former home of the English parliament in the Palace of Westminster, near the City of London.  This lasted nearly a century, until the Acts of Union 1800 merged the separate British and Irish Parliaments into a single Parliament of the United Kingdom with effect from 1 January 1801.
  Title: Diocese of Cork
  Passage: The Diocese of Cork was established in the seventh century.  The diocese of Cork was one of the twenty-four dioceses established at the Synod of Rathbreasail on an ancient bishopric founded by Saint Finbarr in the sixth-century.  On 30 July 1326, Pope John XXII, on the petition of King Edward II of England, issued a papal bull for the union of the bishoprics of Cork and Cloyne, the union to take effect on the death of either bishop.  The union should have taken effect on the death of Philip of Slane in 1327, however, bishops were still appointed to each separate bishopric.  The union eventually took place with Jordan Purcell appointed bishop of the united see of Cork and Cloyne in 1429.
  Title: New Ross, Nova Scotia
  Passage: New Ross is a community in the Canadian province of Nova Scotia, located in the Chester Municipal District.  Home of the Ross Farm Museum.  The village is named after Henry Phipps, 1st Earl of Mulgrave, whose second title derives its name from New Ross, Ireland.
  Title: New Ross (UK Parliament constituency)
  Passage: New Ross was a United Kingdom Parliament constituency, in Ireland, returning one Member of Parliament (MP).  It was an original constituency represented in Parliament when the Union of Great Britain and Ireland took effect on 1 January 1801.
citations: New Ross (UK Parliament constituency) Acts of Union 1800