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The cap of a crown is the cap which fills the inner space of a modern crown. While ancient crowns contained no cap, from mediaeval times it became traditional to fill the circlet with a cap of velvet or other such cloth, with a base of ermine. [1]

References

  1. ^ Norris, Herbert (1 January 1999). Medieval Costume and Fashion. Courier Corporation. p. 177. ISBN  978-0-486-40486-8.