He was associated very early with the Theban Legion and is recorded in the Roman Martyrology, commemorated with St. Victor of Solothurn on 30 September.

[1] The Life of Ursus was written by Eucherius of Lyon in the 5th century;[2] it recounts that Ursus was tortured and beheaded at Solothurn under Emperor Maximian and the governor Hyrtacus for refusing to worship idols around 286.

The legend is classed by Bollandist Hippolyte Delehaye among the historical romances.

[4] His relics are displayed in churches throughout Switzerland, and his coffin was found in 1519 under the choir altar of St. Ursen.

Ursus is the patron of the Roman Catholic cathedral in Solothurn, Switzerland, where his body is located.