Llŷn was an ancient Welsh

cantref A cantref ( ; ; plural cantrefi or cantrefs; also rendered as ''cantred'') was a Wales in the Early Middle Ages, medieval Welsh land division, particularly important in the administration of Welsh law. Description Land in medieval Wales was divid ...

in north-west

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

. It was part of the kingdom of

Gwynedd Gwynedd () is a county in the north-west of Wales. It borders Anglesey across the Menai Strait to the north, Conwy, Denbighshire, and Powys to the east, Ceredigion over the Dyfi estuary to the south, and the Irish Sea to the west. The ci ...

for much of its history until it was included in the new county of

Caernarfonshire Caernarfonshire (; , ), previously spelled Caernarvonshire or Carnarvonshire, was one of the thirteen counties of Wales that existed from 1536 until their abolishment in 1974. It was located in the north-west of Wales. Geography The county ...

, together with Arfon and Arllechwedd under the terms of the

Statute of Rhuddlan The Statute of Rhuddlan (), also known as the Statutes of Wales ( or ''Valliae'') or as the Statute of Wales ( or ''Valliae''), was a royal ordinance by Edward I of England, which gave the constitutional basis for the government of the Principal ...

in 1284. Trahain Goch ap Madoc, died 1325, was described as "of Llŷn".

References

Llyn Commotes of Gwynedd 13th century in Wales {{Gwynedd-geo-stub