Welsh Towns with "Caer" & "Gaer" (Fort/Stronghold) in Their Names

Caer (Welsh) / Gaer (mutated form) = "fort, stronghold, enclosed settlement" (from Latin castrum). Many Welsh towns bear these prefixes:

Major Towns

1. Caerphilly (Caerffili) — South Wales. Massive 13th-c. concentric castle (Gilbert de Clare). Cheese namesake.
2. Caernarfon — Gwynedd, NW. Edward I's UNESCO castle (1283); investiture of Prince of Wales.
3. Caergwrle — Flintshire/Wrexham border. 13th-c. castle (Dafydd ap Gruffydd).
4. Caerleon (Isca Augusta) — Newport. Roman legionary fortress (II Augusta); amphitheater, baths.
5. Caersws — Powys. Roman fort (1st c. AD); road junction.

Villages & Sites

• Gaerwen (Y Gaerwen) — Anglesey. Iron Age hillfort (Din Gaer, 1st c. BC).
• Gaer Fawr — Powys (Brecknockshire). Large Iron Age hillfort.
• Caerwent (Venta Silurum) — Monmouthshire. Roman civitas capital; walls stand 5 m high.
• Caerau — Cardiff suburb; hillfort (Caerau Hillfort).
• Caerwys — Flintshire. Medieval borough charter 1290.

Linguistic Note

Caer → Gaer after feminine nouns or in compounds (mutations). Both mean "fort." Over 100 Welsh place-names start with Caer/Gaer — testament to Roman & native fortification density.