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The horseshoe and boot with spur symbolize the fight against temptations.
They are the instruments to master the horse and they symbolize the control the knight of his inner beast, the vices and the temptations.
Churches:
San Marcos de Salamanca, San Juan de Portomarín (Lugo), Santa María de la Oliva (Navarra), Santa María de Fitero (Navarra), Santa María de Veruela (Zaragoza), San Juan de Barbadelos (Salamanca).
Read more in The stonemason’s signs in the Romanesque churches in Spain.