Plica (sigillography)

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Plica on the deed of Charles IV.

Plica (from Latin plica - fold) is a term from sigillography for the reinforcement of the lower edge of a charter or deed, produced by folding up the bottom of the sheet of parchment to achieve a double thickness.

The purpose of the fold is to provide a more secure anchorage for the seal, and to guard against the parchment being torn. Slots were normally cut in the double thickness of parchment, a cord or tag of parchment threaded through them, and the seal attached to that.


  • Hlaváček, Ivan; Kašpar, Jaroslav; Nový, Rostislav (1994). Vademecum pomocných věd historických (in Czech). Jinočany: H&H. p. 181. ISBN 80-85467-47-X.