This cross is a copy of the cross on which Christ was crucified. It is made of cypress, decorated with precious metals and stones. The Kiya Cross also contains parts of the relics of saints and sixteen stones from Palestinian places where the events described in the Bible took place.

The history of the Kiya Cross deserves special attention. When Father Nikon, who was destined to become a patriarch in the future, sailed on a ship across the White Sea in the 1630s, he was overtaken by a strong storm. The ship washed ashore the island, thanks to which Nikon escaped. In honor of this, he erected a cross on the shore and vowed to build a monastery on the island. Almost twenty years later, the Onega Monastery was founded here and a cross was ordered for it in Palestine, named after the island — Kiysky. After the October Revolution, it was closed, and the shrine was transferred to the anti-religious museum located on Solovetsky Island. Subsequently, the Cross was transported to Moscow, where it was kept in the funds of the Historical Museum. After the collapse of the Soviet Union, the Kiysky Cross was installed in the Church of Sergius of Radonezh.

It is believed that the worship of the Kiya Cross contributes to healing from various diseases, helps people cope with difficult situations, and helps restore spiritual strength.