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.
Blazon: Per fess I per pale gules a castle triple-towered or windowed azure and argent a cross of Calatrava gules, II per fess dancetty or and gules
The arms in the base half of the shield are those of Rodrigo Téllez Girón, twenty-ninth master of the Order of Calatrava, who both founded and gave his name to the town.
Blazon: Per pale gules a well argent and of the second a cross of Calatrava of the first, pointé in base azure a loaf of bread of the second
The arms are primarily canting, due to the cross of Calatrava and the well (“pozo”), though I cannot find any explanation for the loaf of bread.
Blazon: Azure on a pale gules between six houses argent a castle triple-towered or between in chief a cross couped and in base a crescent of the second
These may be canting arms, as the town’s name derives from “poblet,” a ancient diminutive of “town.”