Theonistus (Theonist, Teonesto, Thaumastus, Thaumastos, Theonestus, Thonistus, Onistus, Teonisto, Tonisto) is a saint venerated by the Catholic Church.
[2] Their association with Alban may have come from confusion with Theonistus (or Theomastus, Thaumaustus), an early fifth century bishop of Mainz (feast day: January 1).
[1][3] This figure is mentioned by Gregory of Tours: "Theomastus was noted for his holiness in accordance with the meaning of his name, and he is said to have been bishop of Mainz.
), who says he had been driven from Philippi with Theonistus its bishop, in 425.”[5] This scholar goes on to write that Rabanus Maurus “goes so far abroad as to call [Alban] an African bishop flying from Hunneric...”[5] There is another martyr by this name, Theonistus of Vercelli (feast day: November 20) (Vercelli has a church named Santi Tommaso e Teonesto in S.
The relics of Theonistus and his two companions may also have been enshrined with those associated with Liberalis of Treviso at the cathedral of Torcello after 639 AD.
In the early 19th century, inhabitants of Trevignano hung a picture depicting Jerome at the feet of Theonistus.