The Princes' Chapel (Cappella dei Principi) is a piece of 17th-century Baroque bombast in flamboyant multi-colored marbles, for which the altar was not completed, appropriately enough, until 1939.
Building on the Cappella dei Principi started in 1658.
mnli hypothesis: Building on the Cappella dei Principi started in 1658. premise: The Princes' Chapel (Cappella dei Principi) is a piece of 17th-century Baroque bombast in flamboyant multi-colored marbles, for which the altar was not completed, appropriately enough, until 1939.