Saint Augustine, not yet baptized, claims to have witnessed these events and relates them in his ""Confessions"" (IX, vii), and in ""De Civitate Dei"" (XXII, viii) as well as in his ""Sermon 286 in natal. Ss. Mm. Gerv. et Prot."". They are also alleged by Saint Paulinus in his life of Saint Ambrose. The latter died in 397 and by his own wish was buried in his basilica by the side of these martyrs. It has been suggested that the Brescia Casket was made for or used to hold the relics.