Mowbray, Lords of Gower

Blazon Original arms Shield: Gules, a lion rampant Argent.

The De Mowbrays were Lords of Gower from 1331 to ????.

Blazon Later arms, as dukes of Norfolk Shield: Gules, three lions passant guardant in pale Gules and a label of three points Argent..

After marrying an heiress of Thomas of Brotherton, Earl of Norfolk (son of King Edward I) and being created dukes of Norfolk, the Mowbrays adopted Thomas's arms - the three lions of England differenced by a white label.