Justus (St. Just) was the 13th bishop of Lyon, he is known to have attended the Councils of Valence in 374 and Aquileia in 381. Somewhat later, according to his Vita (5th cent.), he divested himself of the insignia of his office and went into exile in Egypt because he felt responsible for the lynching near his cathedral of a madman who had committed murder. He died in Egypt a few years later, so did soon afterwards his acolyte Viator who had gone with him.
The people of Lyon fetched their bodies and buried them in a mausoleum in the large cemetery which lay on the site of the present-day Archaeological garden, 11, rue des Macchabées.