Tradition states that Justin was a priest and bishop, that Florentius and Felix were his siblings, and that Justa was his niece.
Pagan priests, alarmed by this, contacted Maximian; the authorities ordered the four to sacrifice to Jove.
Justin escaped to a mountain named Tubernium while Florentius, Felix, and Justa were arrested and taken to Forconium (Furci).
Justa was thrown into a burning furnace, but after emerging unharmed, was shot with arrows on August 1 of that year.
Justin, meanwhile, buried the bodies of his brothers beside that of his niece and died of natural causes at the age of eighty-four.