The Early Church Fathers
The Fathers of the Church are the early Church's great personalities and "are also teachers of the faith for us today and witnesses of the perennial timeliness of the Christian faith."
Papa Benedetto has given catecheses on:
Ambrose Autpert, St Ambrose of Milan, St Anselm, Aphraates the Sage, St Athanasius, St Augustine of Hippo, St Basil, St Bede the Venerable, St Benedict of Norcia, St Bernard of Clairvaux, Boethius, St Boniface, Cassiodorus, St Chromatius of Aquileia, St Columba, St Clement of Alexandria, St Clement of Rome, St Cyrpian, St Cyril of Alexandria, St Cyril of Jerusalem, Ss Cyril & Methodius, St Ephrem the Syrian, Eusebius of Caesarea, St Eusebius of Vercelli, St Germanus of Constantinople, St Gregory the Great, St Gregory Nazianzus, St Gregory of Nyssa, St Hilary of Poitiers, St Ignatius of Antioch, St Irenaus of Lyons, St Isidore of Seville, St Jerome, St John Damascene, St John Chrysostom, John Climacus, John Scotus Erigena, St Justin, St Leo the Great, St Maximus the Confessor, St Maximus of Turin, St Odo of Cluny, Origen of Alexandria, St Paulinus of Nola, Peter the Venerable, St Peter Damian, Pseudo-Dionysius the Areopagite, Rabanus Maurus, St Romanus the Melodist, Symeon the New Theologian, Tertullian & St Theodore the Studite.
(Included in this list everyone BXVI gave a catechesis on, up to Saint Bernard of Clairvaux (the 'last' Church Father) .... the list just might include a couple who aren't 'officially' Church Fathers ... apologies if Totus2us has miscategorised!).