EIIR to CIIIR: King Charles' new cypher unveiled

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King Charles III
King Charles III
Photo: Hugo Burnand/Getty Images
  • The cypher featured on government buildings, state documents and new post boxes throughout the UK and 14 other countries within the Commonwealth will feature King Charles' new cypher.
  • Charles asceded the throne following the death of Queen Elizabeth II on 8 September.
  • The new cypher 'CIIIR' for Charles III Rex (king in Latin) replaces the queens 'EIIR' cypher.


Buckingham Palace on Monday revealed King Charles III's new royal cypher - the monogram of his initials that will feature on government buildings, state documents and new post boxes.

His late mother Queen Elizabeth II's cypher was EIIR, standing for Elizabeth II Regina (queen in Latin).

Charles's will be CIIIR for Charles III Rex (king in Latin), with the C intertwined with the R, the III within the R, and the crown above both letters.

A Scottish version of the cypher features the Scottish Crown.

King Charles
The new cypher of King Charles III.

The cypher was designed by The College of Arms, which was founded in 1484 and whose job it is to create and maintain official registers of coats of arms and pedigrees.

The Court Post Office at Buckingham Palace will frank the first items of mail with "CIIIR" on Tuesday, after the end of royal mourning for the queen, who died on 8 September, aged 96.

"The decision to replace cyphers will be at the discretion of individual organisations, and the process will be gradual."
-- Buckingham Palace

The palace mailroom handles some 200 000 items every year, from invitations to events, responses to public letters and cards, and state business.

The new cypher will be used throughout the Royal Household and by government departments.

The accession of Charles, 73, to the throne has already seen an immediate change in the national anthem, from God Save the Queen to God Save the King.

Senior lawyers have become "king's counsel" (KC) instead of "queen's counsel" (QC) for the first time since the death of the late queen's father, king George VI, in 1952.

Other changes - from the king's head on bank notes and coins to the wording inside passports - will gradually be brought in both in Britain and the 14 other countries where he is also head of state.


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