Which saint's feast day is on April 6th?

The following saints are memorialized on April 6:
Agrarius the Martyr
Amand of Grisalba
Berthanc of Kirkwall
Brychan of Brycheiniog
Catherine of Pallanza
Elstan of Abingdon
Florentius of Sirmium
Geminianus of Sirmium
Gennard
Marcellinus the Martyr
Martyrs of Hadiab
Moderata of Sirmium
Pierina Morosini
Prudentius of Troyes
Romana of Sirmium
Rufina of Sirmium
Saturus of Sirmium
Secundus of Sirmium
Sixtus I, Pope
Ulched
Urban of Peñalba
William of Eskilsoe
Winebald
Zefirino Agostini