The Nuttall Encyclopedia
A name applied in the English history to the Union of England and Scotland in 1603 under one crown, by the accession of James VI. of Scotland to the throne of England on the death of Elizabeth; the Union of England and Scotland in 1707, under one Parliament seated at Westminster, into the United Kingdom of Great Britain; and to the Union of the United Kingdom of Great Britain to Ireland in 1801, when the Irish Parliament was abolished, and was represented, as it still is, in the Imperial.
Wood, James, ed. Entry for 'Union, the'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/u/union-the.html. Frederick Warne & Co Ltd. London. 1900.