He is one of the group of Seven Apostolic Men (siete varones apostólicos), seven Christian clerics ordained in Rome by Peter and Paul, and sent to evangelize Spain.

[5] Besides Hesychius, this group includes Torquatus, Caecilius, Ctesiphon, Euphrasius, Indaletius, and Secundius (Torcuato, Cecilio, Tesifonte, Eufrasio, Hesiquio y Segundo).

He evangelized the town of Carcere, Carteia, or Carcesi, identified as Cazorla, became its first bishop, and was martyred there by stoning at La Pedriza.

[3] Tradition also says that Hesychius (or Isicio) gave to the residents of Cabra a statue of the Virgin carved by St. Luke.

The identification of the places where they are said to have evangelized is imprecise: sources also state that Carcere or Carcesi is not Cazorla but Cieza.