Media Cudeyo is situated south of the Bay of Santander in the Spanish Autonomous Region Cantabria. The municipality has a population of about 7,600 (2019) and consists of the localities Anaz, Ceceñas, Heras, Santiago de Cudeyo, Hermosa, San Salvador, San Vitores, Sobremazas, Solares and Valdecilla (administrative centre).
Remains of a medieval castle dating from the 8th to 11th century have been found at Pico del Castillo. Documents referring to Cudeyo date back to at least 1520. Since the 70s of the 18th century , the iron mines located in the Peña Cabarga massif (known since Roman times) have led to the emergence of an industry around mining, establishing several railways that helped transport the extracted material, among them the railway from Santander to Solares, inaugurated in 1892, and later extended to the seaside resort of Liérganes.
The picture on glass no. 4017 [left] shows the old