Mystery Solved!

I got a wonderful email that explained who the saint was on one of the windows at St. George Serbian Orthodox Church in Duluth, MN. It is the Venerable Father Alypius the Stylite. I was fascinated to read about him on Wikipedia here:

"Saint Alypius the Stylite was a seventh century ascetic saint. He is revered as a monastic founder, an intercessor for the infertile, and a protector of children. During his lifetime he was a much sought after starets (guide in the Christian spiritual life).

Alypius was born in the city of Hadrianopolis in Paphlagonia. His mother, who had been widowed early, was very pious. She sent her son to be educated by the bishop Theodore, gave all of her livelihood to the poor, and herself became a deaconess and lived an ascetic life. Alypius built a church in honor of the Great Martyr Saint Euphemia the All-Praised on the site of a dilapidated pagan temple. He erected a pillar beside the church and lived atop it for the majority of his adult life. Two monasteries were built beside his pillar, one for monks and one for nuns, and Saint Alypius served as spiritual director of both. According to his hagiography for the last fourteen years of his life he was unable to stand, and had to lie on his side. He died in 640, at the age of 118. He is recognized as one of the three great stylite ascetics along with Simeon Stylites the Elder and Daniel the Stylite.

Alypius is venerated in the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite, as well as the Roman Catholic Church on November 26.For those churches which follow the Julian Calendar November 26 currently falls on December 9 of the modern Gregorian Calendar. After his death his relics were interred in the Church of St. Euphemia which he had built. His head is preserved in the Monastery of Koutloumousiou on the Mount Athos."