Arms of Ranulf de Gernon, Earl of Chester 1128-1153 (1099-1153) and Maud of Gloucester (?-1189)
From p43 of Lacies Nobilitie by Sir John Ferne (1586)
Blazon: Per pale baron and femme; the first azure three garbs or, the second or three chevronels gules
The arms Ferne gives for Maud (whom he calls Alice) seem to be skipping ahead a few decades. The chevronels are well-known as the arms of the Clare family, who would inherit the earldom of Gloucester in 1225. Maud’s father Robert was the first earl of Gloucester and (probably) the first illegitimate son of Henry I. Since he was born before his father ascended the throne, it is unknown if he bore arms or what they would have been.