The name of the holiday is associated with the church date of honoring the memory of St. Luke of Greece, a Greek monk who lived in the 9-10th century. But among the people, the day was more often called the Mighty Day. This is the name given to cinquefoil, a plant with leaves in the shape of a cross, endowed with a powerful effect on various diseases. The day itself was dedicated to the memory of the deceased forefathers, visited their graves in the cemetery, and prayed in the temple for their calm afterlife.