Among the relics in the cathedral are shackles similar to those worn by St. John, a holy man who was a younger contemporary of St. Basil. The eleventh chapel, added to the cathedral in 1672, is dedicated to him.

Some holy men and women wore shackles under their clothing, hidden so that others would not see their private act of penance. The shackles weighed several dozen kilos, and it is believed the St. John wore shackles that were half his body weight and that he only removed them before his death in 1589.

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