The armorial bearings of the Grand Commandery consist of:
- Green (vert) Maltese cross. Green signifies loyalty
- Over which is laid a Tower to symbolise the Castello
- And then the gold Bourbon fleur-de-lys to symbolise being the seat of the Grand Masters.
Letter from the Grand Officer of Arms
granting the Armorial Bearings of the Grand Commandery of the Castello
The Armorial Bearings of the Grand Commandery of the Castello