| Irgenhausen Castrum (Kleinkastell Irgenhausen) | |
|---|---|
 The Castrum as seen from the west | |
| Alternative name | unknown |
| Limes | Danube-Iller-Rhine Limes (Maxima Sequanorum, rearward line) |
| Date(s) occupied | Valentinian II, 4th to 5th century |
| Type | road respectively hill castle |
| Unit/Formation | unknown |
| Size | 60 metres (197 ft)× 61 metres (200 ft) (0.36 hectares (0.9 acres)) |
| Construction | stone construction |
| Condition | completely excavated, conserved and partly reconstructed |
| Location | Irgenhausen, Canton of Zürich, Switzerland |
| Coordinates | 47°21′30″N 8°47′33″E / 47.358333°N 8.7925°E |
| Height | 562 m |
| Previous fort | Turicum Castrum (Turicum) (west) |
| Fort in front | Vitudurum Castrum (Vitudurum) (north) |
Irgenhausen Castrum is a Roman fort at Irgenhausen, situated on Pfäffikersee lake shore in Switzerland. It was a square fort, measuring 60 metres (197 ft) in square, with four corner towers and three additional towers. The remains of a stone wall in the interior were probably a spa.