The chair-shaped bronze reliquary which holds the throne of St Peter is much larger than a normal chair, is ornate in shape and decorated with relief sculpture and gold leaf. The "Gloria" which surrounds a round window is a sculpture of clouds and sun-rays, surrounded by angels, the whole lot being covered in gleaming gold leaf.
The strangest part of the "Monument to Alexander VII" is the figure of death, seen as a bronze skeleton emerging from the door. In his hand he holds an hourglass, a reminder that death comes to all and our time on earth is limited. His head and a large part of the upper door are obscured by a large cloth shroud made of precious colored stone.