de La Court de la Berthonnière
This was the ancient coat of arms of de La Court de la Berthonnière as borne by Guillaume de La Court (1371-1428). The Abbé M. de Vertot mistook the blazon of de La Court de la Grize, another Poitevan family, for that of La Berthonnière and this error was replicated by a number of heraldic authors who followed, including no less than J.B. Rietstap.
The de la Grize blazon reads Arg three mullets gu arranged 2 and 1, and on a chief three mullets counterchanged. The researches made by Beauchet-Filleau in the second half of the 19th century in the Poitou region of France where Guillaume de La Court resided indicate however that the arms consist of a gold bend charged with a porcupine, all on a green field. Most contemporary records are vague, describing the porcupine in various positions and coloured sable or gules. However the Arm