Venerable Arsenius, founder of the Konevets monastery on Lake Ladoga.
Saint Arsenius was a coppersmith of Novgorod who became a monk and spent three years on Mount Athos. Returning with an icon of the Theotokos, he founded a monastery on the island of Konevets in Lake Ladoga in the late fourteenth century and reposed there in 1447.
Feast day
On the New Calendar, Arsenius of Konevets is commemorated on June 12. Churches on the Old (Julian) Calendar keep the feast on June 25 of the civil calendar.
Also commemorated on June 12

Peter the Athonite
Venerable, Πέτρος ο Αθωνίτης
Venerable Peter the Athonite, first known hermit of the Holy Mountain.
Antonina of Nicaea
Holy Woman, Αντωνίνα
Holy Virgin Martyr Antonina of Nicaea, who suffered under Diocletian.
Name days: Antonina
Synesios, Benedict and Timothy, Monk-Martyrs of Thessaloniki
Martyr, Συνέσιος, Βενέδικτος και Τιμόθεος
Monk-Martyrs Synesios, Benedict and Timothy, monastics put to death in Thessaloniki.
Zeno the Venerable
Venerable, Ζήνων
Venerable Zeno, an ascetic whose memory is preserved in the synaxaria.