Venerable Symeon and Theodore, founders of the Monastery of Mega Spilaion, and the shepherdess Euphrosyne.
The brothers Symeon and Theodore, monks from Thessalonica, were guided by a vision to a great cave in the mountains of Achaia. There, tradition relates, the shepherdess Euphrosyne led them to an icon of the Theotokos painted by the Evangelist Luke, hidden in the cave.
They founded on that spot the monastery of Mega Spilaion, one of the oldest in Greece, and reposed in peace.
Feast day
On the New Calendar, Symeon and Theodore of Mega Spilaion is commemorated on October 18. Churches on the Old (Julian) Calendar keep the feast on October 31 of the civil calendar.
Also commemorated on October 18

Julian the Hermit of the Euphrates
Venerable, Ιουλιανός ο εν τω Ευφράτη
Venerable Julian the Hermit of Mesopotamia, who foretold the death of Julian the Apostate.
Gabriel and Kyrmidoles
Martyr, Γαβριήλ και Κυρμιδώλης
Holy New Martyrs Gabriel and Kyrmidoles, who suffered in Egypt in 1522.
Mnason of Cyprus
Hierarch, Μνάσων
Saint Mnason, Bishop of Tamassos in Cyprus, the early disciple named in the Acts of the Apostles.