This article is about the particular significance of the century
1301 - 1400 to Wales and its people.
Princes of Wales [ ]
Princesses of Wales [ ]
Events [ ]
Denbigh Castle is substantially completed; 183 settlers are recorded as living outside the town walls and only 52 inside the town's defences.
Work on Beaumaris Castle restarts, after a six-year gap, prompted by fears of a Scottish invasion of North Wales. 
Roger Mortimer de Chirk is removed from his office of Justiciar of North Wales. King Edward II of England, as guardian of the three heiresses of the estate of Gilbert de Clare, appoints Payn de Turberville of Coity as administrator.
Despenser War: Roger Mortimer, Humphrey de Bohun, 4th Earl of Hereford, and Thomas, 2nd Earl of Lancaster, agree to attack the Welsh lands of Hugh Despenser the Younger and his father Hugh le Despenser, 1st Earl of Winchester. March - Despenser War: King Edward II travels to Gloucester and calls on the Marcher Lords to join him; Mortimer and Hereford decline. Edward marches on to Bristol, and repeats his call for the Marcher Lords to convene with him there. They again decline.
 May - Despenser War:
Newport, Cardiff and Caerphilly are seized by Roger Mortimer in an intense eight-day campaign. Mortimer and the Earl of Hereford then set about pillaging Glamorgan and Gloucestershire, before marching north to join Lancaster at Pontefract Castle. December - Despenser War: King Edward II of England and his allies march on Cirencester, preparing to invade the Welsh borders. 
February - Following her elopement with (or abduction by) William de la Zouche, Eleanor de Clare, is again imprisoned in the Tower of London.
despite the election of another candidate by the chapter.
Owain Lawgoch launches an unsuccessful invasion attempt on Wales.
May - In Paris,
Owain Lawgoch announces his intention of claiming the throne of Wales. Owain Lawgoch and his invasion force arrive in Guernsey.
Births [ ]
Deaths [ ]
July - Owain Lawgoch, claimant to the principality of Wales (assassinated), ?48
probable - Sir Hywel ap Gruffydd ("Syr Hywel y Fwyall"), soldier in the service of King Edward III of England
References [ ]
Taylor, Arnold (2004) , Beaumaris Castle (5th ed.), Cardiff, UK: Cadw, pp. 8, 10–11, ISBN 1-85760-208-0
^ Pettifer, Adrian, Welsh Castles: a Guide by Counties. Woodbridge: Boydell Press, 2000. p.60.
^ a b Weir, Alison. (2006) Queen Isabella: She-Wolf of France, Queen of England. London: Pimlico Books.
ISBN 978-0-7126-4194-4. p.136.
^ Costain, Thomas Bertam. (1962) The Three Edwards. London: Doubleday. pp.196-97
^ Ian Mortimer,
The Greatest Traitor, Vintage Books, 2010. ISBN 9780099552222. p 157
^ Birch, Walter de Gray, 'A History of Neath Abbey derived from original documents ... with some account of the castle and town of Neath [and] notices of the other monasteries of Glamorganshire' (Neath, 1902) pp. 125-126
Lee, Sidney, ed. (1895). . . Dictionary of National Biography 43. London: Smith, Elder & Co.
Ernest Silvanus Appleyard (1853). . p. 8. Welsh sketches, by the author of 'Proposals for Christian union'
Parry, Charles (2010). The Last Mab Darogan. London: Novasys Limited. p. 49. ISBN . 978-0-9565553-0-4
Ernest Silvanus Appleyard (1853). . p. 165. Welsh sketches, by the author of 'Proposals for Christian union'
Charles Beem (27 October 2008). . Palgrave Macmillan US. p. 162. The Royal Minorities of Medieval and Early Modern England ISBN . 978-0-230-61618-9
Carr Pritchett Collins (1959). . p. 100. Royal Ancestors of Magna Charta Barons: Including Ancestry of John Talbot, 10th Earl of Shrewsbury, and Elizabeth Knox, Daughter of Rev. John Knox and His Wife, Margaret Stewart. The Collins Genealogy; the American Ancetry of Kit, Dick, and Christy Collins
Rev. John Milner, History of Antiquities of Winchester, p. 213.