Arms of Pressigne (a French lord)

From The Blazon of Gentrie by Sir John Ferne (1586), p202

Blazon: Barry of six azure and or counterchanged per pale, a chief paly of six counterchanged per fess between two cantons gyronny of the first and the second, overall an escutcheon argent

This is very, very similar to the Mortimer coat of arms (to such an extent that Torquatus, the knight, refuses to blazon it on those grounds), but the chief in the Mortimer arms is charged with a single pale and not counterchanged, and the cantons are per bend and per bend sinister rather than gyronny.

From The Blazon of Gentrie by Sir John Ferne (1586), p198-199

Blazon: Per saltire or on a bend azure a bendlet gules and of the second three palets argent

“This kind of partition is diversely blazed… the ancients called it Gyronny of four parts. The French blazoners call it, quarterly in bend, of such and such colors.”