Saint Pelagius of Constance was, a child martyr put to death in Pannonia during the persecution of Roman Emperor Numerian. He was first revered in Novigrad (Cittanova) in Istria, Croatia.
Pelagius is the patron saint of Konstanz and the Cathedral of Konstanz, owing to the transfer of relics that were believed to be his to that city before or around 904 AD. He usually does not have a face in his depictions.
A 16th Century wall painting of Pelagius
Tomb in the Cathedral of Constance where Pelagius' relics were kept at least until the Reformation