Ducal coat of arms

Blue a gold sun, irradiated and charged with a star sable, with the border composed of gold and sable upon the ducal crown Proper (thereon a horse head Argent, armed, crined as crest in a second version): for Supporters, dexter a red stag rampant, sinister a red stag salient). Motto 'Ars Vivendi'.

Motto of Duchy