Blazon: Per fess argent a cross of Calatrava gules and or a grill fesswise sable, in base a palm branch embowed proper
The grill is a symbol of St. Lawrence, the patron saint of the town, who was roasted to death. The first records of the town date back to 1588, when a group of peasants told King Felipe II that they were unable to attend Mass because they lived too far from a church.
Blazon: Per pale azure a representation of the local church of Christ of the Valley argent and of the last a cross of Santiago gules, pointé in base or a bunch of grapes slipped and leaved vert
The characteristic church featured on the arms was built in the sixteenth century on the site of the former hermitage of St. Helena, where (according to legend) Christ appeared in the form of a strange traveler.
Blazon: Per fess argent a cross of Calatrava gules and or a shacklebolt in bend sinister sable
The cross of Calatrava reflects the village’s former membership in the Order of Calatrava. The shacklebolt is apparently a reference to the founder of Saceruela, Don Pedro Girón, but I am unsure of the connection.
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 argent a castle gules windowed or and of the last a bend wavy azure
The castle may be either a reference to or a representation of one of two local castles; the castle of Prim, a military residence that once hosted a meeting between Juan Prim y Prats and Pope Pius IX, or the castle Milagro (Castle of the Miracle) which was built by Rodrigo Jiménez de Rada during the Reconquista.
In use since at least 2013
Per fess argent a Maltese cross gules between two laurel branches proper and vert a tower or windowed sable
The Maltese cross is probably a reference to the Order of St. John, which maintained control over the area until 1784.
Blazon: Per pale vert a castle triple-towered or windowed azure and argent a cross of Santiago gules, pointé in base azure from a base proper a column argent
The Order of Santiago took possession of the region around the town in 1186, ultimately using it as a military basis during the Reconquista. They were formally granted ownership in 1243; this is likely the source of the cross of Santiago. I can only speculate that the column is a reference to the many local ruins from Roman times.