| Y Gaer (Cicucium) | |
|---|---|
| Powys, Wales, UK | |
 Remains of the Roman fort | |
  Y Gaer (Cicucium) Location in Powys | |
| Coordinates | 51°57′23″N 3°27′06″W / 51.9565°N 3.4517°W |
| Grid reference | SO00332966 |
Y Gaer (Latin: Cicucium) is a Roman fort situated near modern-day Brecon in Mid Wales, United Kingdom. Y Gaer is located at grid reference SO00332966 (Landranger 160).