"Catalan-Aragonese Crown" it is the name given in Catalonia to the former Crown of Aragon as it better expresses the reality of the union of the two kingdoms. The fact "Catalonia was a kingdom" is confirmed by the seven manuscripts (s.xii to s.xv) of the book "Llibre dels feits del rei en Jacme"^[1], official documents that prove this designation.

The definition «Corona Aragonum et Catalonia» appears on the Privilege of annexation to the Kingdom of Mallorca on 16, Oct., 1286 (Ferran Soldevila, Historia de Catalunya, Barcelona, ed. Alpha, 1962, p. 383, note 29), videt: Great Encyclopedia Catalana, Aragonese Great Encyclopedia. (Armand Fluvià) Peter IV of Aragon (4th in the separate kingdom of Aragon) called himself "Peter third" (catalan numerical order of kings of Catalonia)

Castile and Leon have a very similar situation, historically was the "Crown of Castile", but is universally accepted by many institutions including the government of Spain, the expression "CORONA CASTELLANO-LEONESA" .

So if it is the union of two kingdoms they can be defined perfectly as the "Crown of Catalonia and Aragon" "Catalan-Aragonese Crown".. as is the case of "CORONA CASTELLANO-LEONESA"