Coat of Arms of the Dukes of Portland (adopted in 1802 after their name became Cavendish-Bentinck)
Blason:
Arms: Quarterly: 1st and 4th, Azure a cross moline Argent (Bentinck); 2nd and 3rd, Sable three stags' heads cabossed Argent attired Or, a crescent for difference (Cavendish)
1st Crest: Out of a ducal coronet proper two arms counter-embowed vested Gules, on the hands gloves Or, each holding an ostrich feather Argent (Bentinck)
2nd Crest: A snake nowed proper (Cavendish)

Supporters: Two lions double queued, the dexter Or and the sinister sable
Own work
Varavour