Yon

Saint Yon (in Latin Ionius or Aeonius, in Germanic Eudo) is a Catholic saint, commemorated on 5 August; according to tradition, he died in the year 290.

He is said to have been a disciple of Saint Denis of Paris and to have preached the faith in what is today the Hurepoix, above all at Châtres, now Arpajon, where he is said to have built a church. He is said to have suffered martyrdom in the year 290, on the hill where the village of Saint-⁠Yon now stands. He is the patron of Saint-⁠Yon and a secondary patron of Arpajon; he is depicted beside Saint Denis in the fresco of the basilica of Notre-⁠Dame-⁠de-⁠Bonne-⁠Garde at Longpont. The Brothers of the Christian Schools were called the Brothers of Saint-⁠Yon in the eighteenth century because their main house was the manor of Saint-⁠Yon near Rouen. He is a saint of the undivided Church, honoured locally, without synodal canonization.