I have found a better candidate as the source of Ian Heath's Sergeant-at-Arms in Armies of Feudal Europe 1066-1300
In an illumination of Louis IX setting out on the Seventh Crusade in a Chroniques de France ou de St Denis are 3 horsemen that fit the description. This is dated after 1332 & before 1350, but if this is not the source then it would be a similar scene in another Chroniques de France ou de St Denis manuscript.
MIRROR SITE
British Library MS Royal 16 G VI - Chroniques de France ou de St Denis
See also a similar figure in the Cantigas de Santa Maria representing a French magistrate's enforcer.
Druzhina
14th Century Illustrations of Costume & Soldiers
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