Vindonissa (from a Gaulish toponym in *windo- "white") was a Roman legion camp at modern Windisch, Switzerland. It was probably established in 15 AD. In an expansion around 30, thermal baths were added. The Legio XIII Gemina was stationed at Vindonissa until 44 or 45. With the arrival of the 21st legion (XXI Rapax) the camp was rebuilt with stone fortifications.