1st November is a Public Holiday in Portugal.
It is All Saints day.
The first All Saints' Day occurred on May 13, 609 (C.E.) when Pope Boniface IV accepted the Pantheon as a gift from the Emperor Phocas. Boniface dedicated it as the Church of Santa Maria Rotonda in honor of the Blessed Virgin and all martyrs.
During Pope Gregory III's reign (731-741), the festival was expanded to include all saints and a chapel in St. Peter's church was dedicated accordingly. Pope Gregory IV officially designated the day in 837.