- Commissioner: Baron Arnold von Vietinghoff-Scheel, landlord of Mazsalaca (Salisburg) and Krape (Kroppenhof) Manors
- Drawing: history painter from Dresden Anton Dietrich (1933–1904)
- Created: at Bruno Urban (1851–1910) Institut für Glassmalerei in Dresden, 1885.
- Date: 1885
- Material: Painted glass, lead,
- Size: 545 x 145 cm.
- Conservation: During World War II removed and placed in the cellar. Restored in 1962; restorer: Alfrēds Lilientāls (1886–1980), pedagogue of Riga Secondary School of Applied Arts, together with his students. In 2011–2012 restored by Andris Kļavnieks.
A two-part arcade is placed in the center of the ornamental window; Apostle Peter with large keys is seen to the right, but the Apostle Paul is holding a sword in one hand and a book in the other – to the left.
The apostles Peter and Paul are among the most visible personalities in the New Testament. The name of the apostle Peter, translated from the Greek, means “rock”, which symbolizes the depth of faith. The faith of the Apostle Peter has experienced both doubt and prohibition, but it has not diminished his longing for God. The apostle Paul, from persecutor of the followers of Jesus, through the very personal experience of God, became a zealous defender of the Gospel. Paul is a missionary and did not depart from Jesus’ message until the hour of his death. His written letters in the New Testament to first parishes were a testimony to the formation of the Christian life and the confession of faith.