Ynys Môn (; officially called Anglesey until 1983) is a constituency of the House of Commons of the Parliament of the United Kingdom. It elects one Member of Parliament (MP) by the first past the post system of election. It is one of five 'protected constituencies' within the UK, with boundaries defined by the Parliamentary Constituencies Act 2020 to be to those of Isle of Anglesey County Council where there must be a whole number of MPs rounded up to the nearest whole number with these boundaries.

The Ynys Môn Senedd constituency was created with the same boundaries in 1999 (as an Assembly constituency).

As of 2024, Ynys Môn is represented by Llinos Medi of Plaid Cymru.

Constituency profile The seat covers the isles of Anglesey and Holy Island. Incomes and house prices are slightly below average for the UK. Electoral Calculus describes the seat as "Traditionalist", characterised by socially conservative Labour-inclined voters with lower levels of income and formal education.Electoral Calculus https://www.electoralcalculus.co.uk/fcgi-bin/seatdetails.py?seat=Ynys+Mon

History The Laws in Wales Act 1535 (26 Hen. 8. c. 26) provided for a single county seat in the House of Commons for each of 12 historic Welsh counties (including Anglesey) and two for Monmouthshire. Using the modern year, starting on 1 January, these parliamentary constituencies were authorised in 1536.

The Act contains the following provision, which had the effect of enfranchising the shire of Anglesey: And that for this present Parliament, and all other Parliaments to be holden and kept for this Realm, one Knight shall be chosen and elected to the same Parliaments for every of the Shires of Brecknock, Radnor, Mountgomery and Denbigh, and for every other Shire within the said Country of Dominion of Wales;

The earliest known results are a fragment of the 1541 returns, in which the name of the Knight of the Shire for Anglesey (as Members of Parliament from county constituencies were known before the 19th century) has been lost.(currently unavailable ) It is not known if Anglesey was represented in the parliaments of 1536 and 1539.

The borough constituency of Newborough, soon renamed Beaumaris, returned a member of parliament for the boroughs of Anglesey. It was abolished in 1885, leaving only the county constituency of Anglesey. The official name of the constituency in English was Anglesey, until it was replaced by the Welsh name . Parliament approved the change, to take effect from the 1983 general election. This was purely an alteration of the official name, as no boundary changes were involved.

Boundaries Geographically, the constituency of Ynys Môn comprises the whole of the main island of Anglesey and the smaller Holy Island.

The Parliamentary Constituencies Act 2020 amends Schedule 2 to the Parliamentary Constituencies Act 1986 in granting Ynys Môn "protected" status, meaning the island must have a whole number of constituencies exclusively within the boundaries of the island.

Members of Parliament MPs 1545–1640

ParliamentMember 1545 William Bulkeley 1547 William Bulkeley 1549 Sir Richard Bulkeley (I) 1553 (Mar) Lewis Ab Owen ap Meurig 1553 (Oct) William Lewis 1554 (Apr) Sir Richard Bulkeley (I) 1554 (Nov) Sir Richard Bulkeley (I) 1555 William Lewis 1558 Rowland Ap Meredydd 1562–3 Richard Bulkeley (II) 1571 Sir Richard Bulkeley (I) 1572 Lewis Ab Owen ap Meurig 1584 Owen Holland 1586 Sir Henry Bagenal 1588 Richard Bulkeley (III) 1593 William Glynne 1597 Hugh Hughes 1601 Thomas Holland 1604 Sir Richard Bulkeley (II) 1614 Sir Richard Bulkeley (II) 1621 Richard Williams 1624 John Mostyn 1625 Sir Sackville Trevor 1626 Richard Bulkeley (IV) 1628 Richard Bulkeley (IV)1639–1640 No Parliaments summoned

MPs after 1640

Short Parliament April 1640: John Bodvel

Long Parliament 1640–1644: John Bodvel (Royalist) – disabled to sit, 5 February 1644 1646–1648: Richard Wood – excluded in Pride's Purge, December 1648

Anglesey was unrepresented in Barebone's Parliament

First Protectorate Parliament 1654–1655: Col. George Twisleton 1654–1655: William Foxwist

Second Protectorate Parliament 1656–1658: Col. George Twisleton 1656–1658: Griffith Bodwrda

Third Protectorate Parliament 1659: Col. George Twisleton

ElectionMemberPartyApril 1660The Viscount BulkeleyCourt1661Nicholas BagenalCourtFebruary 1679Hon. Henry BulkeleyToryAugust 1679Hon. Richard BulkeleyTory1685The Viscount BulkeleyTory1689Hon. Thomas BulkeleyTory1690The Viscount BulkeleyTory1704The Viscount BulkeleyTory1715Owen MeyrickWhig1722The Viscount BulkeleyTory1725Hugh WilliamsWhig1734Sir Nicholas Bayly, BtOpposition Whig1741John OwenOpposition Whig1747Sir Nicholas Bayly, BtOpposition Whig1761Owen MeyrickWhig1770Sir Nicholas Bayly, BtOpposition Whig1774The Viscount BulkeleyOpposition, later allied to Burke and later still to Pitt1784Nicholas BaylyIndependent Whig, supported Pitt1790Hon. William PagetWhig, supported Pitt1794Hon. Sir Arthur PagetWhig1807Hon. Berkeley PagetWhig1820The Earl of UxbridgeWhig1832Sir Richard Williams-Bulkeley, BtWhig1837Hon. William StanleyWhig1847 Sir Richard Williams-Bulkeley, BtWhig1859Liberal1868Richard DaviesLiberal1886Thomas LewisLiberal (Gladstonian)1895Ellis Ellis-GriffithLiberal 1916 Coalition Liberal1918Sir Owen ThomasIndependent Labour1923 by-electionSir Robert Thomas, BtLiberal1929Lady Megan Lloyd GeorgeLiberal1931Independent Liberal1935Liberal1951Cledwyn HughesLabour1979Keith BestConservative1983 Name changed to Ynys Môn1987Ieuan Wyn JonesPlaid Cymru2001Albert OwenLabour2019Virginia CrosbieConservative2024Llinos MediPlaid Cymru

Election results Election graph

Elections in the 1830s

Caused by Williams-Bulkeley's resignation

Elections in the 1840s

Elections in the 1850s

Elections in the 1860s

Elections in the 1870s

Elections in the 1880s

Elections in the 1890s

Elections in the 1900s

Elections in the 1910s

Elections in the 1920s

Elections in the 1930s

Elections in the 1940s

Elections in the 1950s

Elections in the 1960s

Elections in the 1970s

Elections in the 1980s

Elections in the 1990s

Elections in the 2000s

Elections in the 2010s

Of the 67 rejected ballots: 51 were either unmarked or it was uncertain who the vote was for. 16 voted for more than one candidate.

Of the 121 rejected ballots: 96 were either unmarked or it was uncertain who the vote was for. 24 voted for more than one candidate. 1 had want of official mark.

Elections in the 2020s

See also Ynys Môn (Senedd constituency) List of parliamentary constituencies in Gwynedd List of parliamentary constituencies in Wales

References

Further reading The House of Commons 1509–1558, by S.T. Bindoff (Secker & Warburg 1982)

F W S Craig, British Parliamentary Election Results, 1918–1949; Political Reference Publications, Glasgow, 1949 Keele University , UK General Election Results, 1950

External links Ynys Môn UK Parliament constituency (boundaries April 1997 – April 2010) at MapIt UK Ynys Môn UK Parliament constituency (boundaries April 2010 – May 2024) at MapIt UK Ynys Môn UK Parliament constituency (boundaries from June 2024) at MapIt UK