Feastday August 20 – St. Bernard of Chiaravalle (known today as St. Bernard of Clairvaux) was the central figure in a Eucharistic Miracle in the 12th Century, where he converted a schismatic excommunicated Duke immediately by going outside the church doors to show him the Eucharist.
Eucharistic Miracle of St. Bernard of Clairvaux, France – 12th Century PDF