Quirinus of Tegernsee, or Quirinus of Rome, is venerated as a martyr and saint of the third century.
According to one tradition, he was beheaded during the reign of Claudius Gothicus. His corpse was thrown into the Tiber and later found at Tiber Island.
Wikipedia https://en.wikipedia.org/wiki/Quirinus_of_Tegernsee
Coordinates 47°43'24.159" N 11°42'31.14" E