The nineteenth day of June.
- 325: The First Council of Nicaea releases the original Nicene creed.
- 445: Valentinian III publishes an edict against the Manicheans.
- 1891: Giuseppe Melchiorre Sarto (later Pope Pius X serves as assistant at the Pontifical Throne.
- Saint Romuald (died 1027)
- Blessed Odo of Cambrai
- Blessed Remi Isoré (died 1900)
- Saint Juliana Falconieri