Blazon: Per fess gules a Maltese cross argent and of the second a cross of Burgundy couped of the first
The cross of Burgundy was formerly a symbol of the Valois Dukes of Burgundy. The duchy was later incorporated into the Habsburgs’ holdings. When the Habsburgs inherited the crowns of Castile and Aragon, the cross of Burgundy came into use as a Spanish symbol. It is also called the Cross of St. Andrew; I have used the former name to distinguish it from the argent saltire on azure that is the British Cross of St. Andrew.