Arms of Saer de Quincy, Earl of Winchester and (1170 – 1219) and Margaret de Beaumont (unknown)
From p81 of Lacies Nobilitie by Sir John Ferne (1586)
Blazon: Per pale baron and femme gules seven mascles 3, 3, and 1 or and gules a cinquefoile ermine
Since Saer de Quincy married one of the two heiresses of the de Beaumont family, he was entitled to bear the arms of the Beaumonts marshalled with his own. (Margaret’s brother, Robert de Beaumont, Earl of Leicester, died in 1204.) However, since Margaret was the younger sister, the title Earl of Leicester passed to her older sister’s husband.