Blazon: Per fess I per pale two cauldrons in pale chequy or and sable, each containing twelve serpents, eight facing the exterior and four facing the interior proper and chequy of nine argent a lion rampant gules (León) and gules a castle triple-towered or windowed azure (Castile), II gules on water in base barry wavy argent and azure a castle triple-towered or windowed azure, surmounted by a four-spoked cog-wheel sable
Blazon: Per fess I per pale gules two cauldrons in pale chequy or and sable, each containing twelve serpents, eight facing the exterior and four facing the interior proper and chequy of nine argent a lion rampant gules (León) and gules a castle triple-towered or windowed azure (Castile)*; II argent a lion rampant bearing in its forepaws a man’s head couped and bearded gules
*The blazon specifies that the second, fourth, sixth, and eighth quarters contain Castile; I believe the blank eighth quarter in this rendition is an artist’s error.
Marquis, later duke of Mortemart 1650-1675 (1600-1675)
Blazon: Party of eight I gules a crescent vair (Maurre), II azure between three fleurs-de-lis or a bendlet couped gules (Bourbon), III gules nine mascles 3, 3, and 3 or (Rohan), IV barry of ten argent and azure three chevronels gules (Rochefoucault), V argent a serpent nowed azure and devouring a child gules (Milan), VI gules a chain in saltire, cross, and orle or, charged with a center point vert (Navarre), VII gules a pale vair (Escars), VIII ermine (Bretagne); overall an escutcheon barry nebuly of six argent and gules (Rochechouart)
Blazon: Per pale argent two cauldrons in pale per fess or and gules charged with six fusils conjoined in fess counterchanged, each containing as many serpents proper and or a saffron flower slipped and leaved also proper
To [astronomers] would be applied for coat-armor a blue field, and in the same, some of the heavenly bodies, as Planets or Stars, or some of those instruments, wherewith they take their zeniths, elevations, longitudes, etc. also a Serpent biting her tail etc.
– From The Blazon of Gentrie by Sir John Ferne (1586), p50