The “cross of Calatrava” is also called the “cross of Aviz”; it was the insignia of the Knights of Calatrava, an Iberian order founded in 1158 [Spada’s Onori e Glorie: Sovrano Militare Ordine, p.59]. It was originally a highly ornamental form of the cross flory.
The King of Calontir bears: Purpure, a cross of Calatrava, in chief a crown within in bordure a laurel wreath Or.
Costança Daguiar bears: Argent, a cross of Calatrava and a double tressure azure.
Aethelwine Aethelredson bears: Paly of four sable and Or, a cross of Calatrava counterchanged.