Claim: Quirinus of Tegernsee (martyr and saint of the third century) died around 270 AD and has a feast on June 16.
Evidence: Quirinus of Tegernsee, or Quirinus of Rome (not to be confused with Quirinus of Neuss, also sometimes called Quirinus of Rome), is venerated as a martyr and saint of the third century. ~270 AD Eastern Orthodox Church
Roman Catholic Church Tegernsee, Bavaria March 25; June 16 (translation of relics) His feast is celebrated on March 25.