Blazon: Per pale argent a pall gules and of the last, a Maltese cross of the first, pointé in base barry wavy of the first and azure
Although Ruidera fell into the territory of the Order of Santiago (per a 1237 treaty), it ultimately ended up as the property of the Order of St. John in 1783, which is probably the source for the Maltese cross. There are also many lagoons and wetlands in the area under national protection, which may be the source of the barry wavy point.
Blazon: Per fess gules a Maltese cross argent and of the second a cross of Burgundy couped of the first
The cross of Burgundy was formerly a symbol of the Valois Dukes of Burgundy. The duchy was later incorporated into the Habsburgs’ holdings. When the Habsburgs inherited the crowns of Castile and Aragon, the cross of Burgundy came into use as a Spanish symbol. It is also called the Cross of St. Andrew; I have used the former name to distinguish it from the argent saltire on azure that is the British Cross of St. Andrew.
Blazon: Per fess I per pale gules a Maltese cross argent and chequy of fifteen azure and the second, II of the third a sword in bend and a spear in bend sinister, points to the chief, surmounted by “Mambrino’s helmet,” all of the second.
This depiction is not particularly accurate; the original blazon specifies that the lower half of the shield should be azure, with argent charges. Inexplicably, the official site of the city uses a very similar depiction as that seen here.
The final charge is a reference to an incident in the Cervantes novel Don Quixote de la Mancha. The titular character sees a barber caught in the rain and wearing a basin as an impromptu hat, and declares this basin to be the fabled helmet of the legendary Moorish king Mambrino, which is supposed to make the wearer invulnerable. The novel also makes reference to the town, and a local legend holds (without much proof) that Cervantes was once imprisoned in a cave near the town.
Blazon: Per fess sable charged with a bar wavy azure, I per pale gules a tower or windowed of the second and of the third a Maltese cross argent, II of the second a wall of four towers of the fourth windowed and masoned of the first
The wall in the lower half of the arms presumably represents the local Roman observation tower. The town’s name derives from the sandy terrain (arenales) and its history with the Order of St. John, which is likely the source of the Maltese cross.
Blazon: Gules on a pale or between two seaxes palewise points upward addorsed argent hilted and pommeled of the second two lioncels azure; overall a on a fess wavy argent another sable
Crest: On a wreath of the colors a garb or surmounted by a mount vert, thereupon a boar passant azure crined and unguled of the second supporting with the dexter forehoof a Maltese Cross gules
Supporters: Two lions sable, armed and langued gules, each gorged with a riband argent pendent therefrom by a ring a molet of the last surmounted by a pentagon or fimbriated and charged with a fleur-de-lis vert and holding in the mouth a shuttle erect threaded proper.