Senwyr

Who they were

Senefyr, or Senewyr, called also Tudglyd (6th cent.), son of Seithewyn, member of the Monastery of Bangor.

The miracles

There was never a formal cause: he has been honoured as a saint since before the Church's formal processes began.

Why that counted as sanctity

Stanton's Menology of England and Wales (1887) names him in its list of other Welsh saints, many of whom, it says, were probably never in fact honoured as saints.