The arms borne by the Thynne family are: Quarterly: 1st and 4th, barry of ten Or and Sable (Botteville); 2nd and 3rd, Argent, a lion rampant with tail nowed and erected Gules (Thynne). This can be translated as: a shield divided into quarters, the top left and bottom right made of ten horizontal bars alternating gold and black (for the Boteville family); the top right and bottom left quarters white with a red lion rampant with a knotted tail (for the Thynne family).
