Russian school, 18th century. "Déesis with the allegory of the days of the week in the form of the saints. Sedmitsa". Tempera, gold leaf, on panel. Measurements: 31 x 26 cm. The icon representing this type of Déesis, Jesus Christ seated with the selected saints, in the Russian Orthodox Church is called "Sedmitsa", translated from the old Russian meaning week. The iconography of the Week or "Sedmitsa" is based on the Orthodox liturgical tradition, which associates each day of the week with the commemoration of a particular holy event. This tradition is most consistently expressed in the canons of the Matins of Octoechos. According to this liturgical book, two songs are sung at Matins on weekdays. One of the two songs on Monday is dedicated to the incorporeal (angelic) forces and on Tuesday to St. John the Baptist. The canons on Wednesday and Friday are dedicated to the Cross and the Mother of God, those on Thursday to the Apostles and St. Nicholas, those on Saturday to all the saints and the dead. Finally, the first and most important of the three Sunday canons is that of the Resurrection of the Lord. The composition of this icon is crowned by the central representation of God the Father. The frame of the icon shows old traces of the stencilling and polychromy.