The first known wonder was worked by the icon during the Tartars incursion to Kostroma. The army of the Prince of Kostroma took the field against them, the image being brought ahead. All of a sudden the image irradiated extraordinary powerful bright rays. That dazzling light stopped Tartars and stampeded them.
There were many other wonders made by the Most-Holy Mother of God through her Theodorovsckaya icon but it became famous most of all after on March 27\14, 1613 with this image the great eldress Martha blessed her son Michael to reign, the youth becoming the first tsar of the Romanovs dynasty on Russian throne. Since then the Theodorovsckaya icon has been especially hallowed by all members of tsar family. Many Russian tsarinas and princesses, being foreigners by birth and conversed to Orthodoxy, got their patronymics in honor of the Theodorovsckaya icon.
Not only nationally significant events are related to the image. The icon has made and is still making many wonders grassroots as well. In this image of Hers the Mother of God is hallowed as the patroness of family well-being; of happy event for childless couples. She also assists in difficult delivery, and lends an especially attentive ear to motherly prayer. “O Mother of God, rescue thy servants of misfortunes”, is written on the small icon reverse.
The Theodorovskaya icon of the Most-Holy Mother of God is kept in St. Anastasia Cathedral of the Theophany in Kostroma. Two solemn festivals are established in honor of the wonder working image: August 29 (stilo novo) – in remembrance of the icon miraculous appearance in 1239; and March 27 ― in remembrance of electing and proclaiming Michael Romanov the tsar.