BattlefieldsEdward I Advance to Gwynedd 1277
Medieval

Edward I Advance to Gwynedd 1277

1277
Caernarfonshire, Wales
Also known as: First Welsh War — Edward I builds road and fleet
Era
Medieval
Battle Type
Skirmish
Location
Caernarfonshire, Wales
Status
Unregistered
The Combatants

Who Fought

Defeated
Wales (Llywelyn ap Gruffudd)
Forces
Llywelyn c.3,000–4,000; logistical campaign.
VS
Victor
England (Edward I)
Forces
Edward I c.6,000–8,000
Outcome
Llywelyn isolated in Snowdonia; Anglesey occupied; Treaty of Aberconwy forces major concessions
The Battle

History & Significance

Edward I conducted the First Welsh War of 1277 as a purely logistical operation, building a coastal road and using a fleet to seize Anglesey and cut off Snowdonia's grain supply. Llywelyn was starved into submission without a major battle. The Treaty of Aberconwy stripped him of most of his overlordship and reduced him to the ruler of Gwynedd alone. Edward had learned from the failures of previous English kings that fighting in Wales required controlling the coastal supply lines.

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