Edward I's Castles in Wales

Edward I's castle-building programme in Wales was the largest and most expensive construction project in medieval Britain. The castles he built — Flint, Rhuddlan, Aberystwyth, Builth, Conwy, Caernarfon, Harlech, and Beaumaris — remain some of the finest examples of medieval military architecture in the world. Several are now UNESCO World Heritage Sites.

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Purpose of the Castles

Edward's Welsh castles served multiple purposes:

Purpose	Explanation
Military control	Each castle housed a permanent garrison of soldiers ready to suppress any Welsh rebellion
Administrative centres	The castles served as the headquarters of English government in Wales; sheriffs and royal officials worked from them
Symbols of conquest	The massive scale and sophisticated design of the castles sent a clear message of English dominance
Supply bases	Many castles were located on the coast or on rivers, allowing resupply by sea — vital in hostile territory
Colonial towns	Most castles were paired with planned towns (bastides) populated by English settlers, creating centres of English culture and commerce