This article discusses a newly restored 17th-century icon called «St. Sergius, Nikon and Savva» from the Trinity Cathedral of the Holy Trinity Sergius Lavra. The researchers detail the history of the icon, previous restoration efforts, and recent restoration work. Despite being darkened and hidden under layers of paint for a long time, the icon's significance was overlooked until now. The recent restoration revealed unique details about the technique and manufacturing of the icon, shedding light on its iconography. This discovery opens up opportunities for further exploration in the field of art history.