Every year on November 1, the Catholic Church observes All Saints' Day, a solemn holy day. The saints of the Church, or all those who have entered heaven, are honored on this day.

All Saints' Day celebrations often center around known saints or those who are officially recognized by the Catholic Church as part of the canon of saints, although millions or possibly billions of people may already be saints.

The celebration of "all the martyrs'' in the early fourth century is the oldest known feast day in honor of all the saints. Following the destruction of the catacombs by multiple waves of invaders in the early seventh century, Pope Boniface IV exhumed some twenty-eight wagonloads of bones and reburied them beneath the Pantheon, a Roman temple honoring all the gods. In keeping with the previous remembrance of all the martyrs, the pope rededicated the shrine as a Christian church on May 13, 609 AD. Many Eastern Churches continue to celebrate all the saints in the spring, either during the Easter season or right after Pentecost, following this custom.

Pope Gregory III instituted the holy day on November 1 in the mid-eighth century as a day dedicated to the saints and their relics. Historians remain confused as to how the Western Church came to celebrate this feast, which is currently observed as a solemnity, in November.

Since All Saints' Day is a Catholic Holy Day of Obligation unless they have a very good reason—like a grave illness—all Catholics must attend Mass on that day.

Other Saints of the Day
Saint Valentine Berrio-Ochoa
Saint Acha the Confessor
Saint Caesarius & Julian
Saint Jerome Hermosilla
Saint Pabiali