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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.
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 |
Exam Tip: Always emphasise the dual purpose of Edward's castles — they were both military strongholds and symbols of English authority. The best answers link the castles to the broader strategy of conquest and colonisation.
Edward employed the greatest military architect of the age, Master James of St George, from Savoy (in modern-day France/Switzerland). James had designed castles for Edward's ally, Count Philip of Savoy, and was brought to Wales to oversee the entire building programme.
| Fact | Detail |
|---|---|
| Full name | Master James of St George d'Esperanche |
| Origin | Savoy (modern France/Switzerland) |
| Role | Master of the King's Works in Wales |
| Salary | 3 shillings per day — an enormous sum (a skilled mason earned about 2–4 pence per day) |
| Innovations | Concentric design; twin-towered gatehouses; murder holes; arrow loops; sea gates |
| Castle | Location | Key Features |
|---|---|---|
| Flint | Northeast Wales, on the Dee estuary | First castle built; distinctive detached great tower (donjon); paired with a planned town |
| Rhuddlan | North Wales coast | Concentric design; the river was diverted to provide a navigable channel to the sea |
| Aberystwyth | West Wales coast | Concentric design; controlled Cardigan Bay; suffered storm damage and Welsh attack |
| Builth | Central Wales | Timber and stone; controlled a key river crossing; has almost completely vanished |
These were Edward's masterpieces — larger, more sophisticated, and far more expensive than the first campaign castles.
| Feature | Detail |
|---|---|
| Design | Linear castle with eight massive round towers along a rocky outcrop |
| Walls | Up to 4.5 metres thick |
| Construction time | Largely complete in just 4 years (1283–1287) |
| Cost | Approximately £15,000 — a vast sum |
| Town | Paired with a walled town; the town walls survive almost intact |
| Feature | Detail |
|---|---|
| Design | Deliberately modelled on the walls of Constantinople; polygonal (many-sided) towers; banded masonry in different coloured stone |
| Symbolism | Intended as the political capital of English Wales; Edward's son (the future Edward II) was born here in 1284 |
| Eagle Tower | The most impressive tower; topped with eagle sculptures symbolising imperial power |
| Cost | Approximately £22,000 — the most expensive of all Edward's castles |
| Town | Large planned town with walls, gates, and a quay |
Key Term: Caernarfon's design was deliberately intended to evoke the Roman Empire and the walls of Constantinople. Edward was making a political statement — he was not just a feudal lord but an imperial ruler. The polygonal towers and banded stonework had no parallel in British castle design.
| Feature | Detail |
|---|---|
| Design | Concentric castle on a dramatic cliff-top site overlooking the sea |
| Concentric defences | Inner ward with four massive round towers; lower outer ward providing a second line of defence |
| The Way from the Sea | A fortified stairway leading from the castle down to the shore, allowing resupply even during a siege |
| Cost | Approximately £8,200 |
| Garrison | Originally 36 men — the design meant a small garrison could defend a huge fortress |
| Feature | Detail |
|---|---|
| Design | The most technically perfect concentric castle ever built; perfectly symmetrical |
| Location | Flat ground on Anglesey — unlike the other castles, which used natural rock formations |
| Defences | Inner ward with six towers and two massive gatehouses; outer ward with 12 towers; moat supplied by the sea |
| Unfinished | Never completed due to lack of funds; even unfinished, it is considered the ultimate expression of medieval castle design |
| Cost | Approximately £11,000 (and it was never finished) |
Edward's castle-building programme was staggeringly expensive.
| Category | Cost |
|---|---|
| Total estimated cost | Approximately £80,000–£100,000 over 25 years |
| Context | The annual royal income was approximately £30,000 — the castles consumed several years' worth of royal revenue |
| Workforce | At peak construction, up to 3,500 workers were employed at a single site, with total numbers across all sites reaching tens of thousands |
| Materials | Stone, timber, iron, lead, and lime were transported from across England and Wales |
Exam Tip: The cost of the castles is a key exam point. The enormous expense strained Edward's finances and contributed to his conflicts with his barons over taxation. When evaluating the castles, always discuss whether the cost was justified by the security they provided.
The most important architectural innovation was the concentric design — a castle within a castle.
| Feature | Purpose |
|---|---|
| Inner ward | The main stronghold; higher walls and towers; the last line of defence |
| Outer ward | A lower ring of walls and towers surrounding the inner ward; provided a first line of defence |
| Kill zone | The space between the two walls where attackers were trapped and exposed to fire from both walls |
| Multiple gatehouses | The strongest point of a concentric castle; heavily fortified with murder holes, portcullises, and arrow loops |
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