Arthurg, is quite common to mix different tipes of grapes. The varieties you wrote here are among the most popular ones, specially the French Carbernet Sauvignon and the Spanish Tempranillo. 100% Tempranillo wine is highly apreciated.
I din't tried
Castillo de Monjardín , it must be a good wine for sure. The winery is located in the village of Villamayor de Monjardin, in the region of Navarre, betwen Logroño and Pamplona cities, near Rioja.
Monjardín is the name of the mountain beside the town, on the top there are the ruins of a medieval castle(castillo).
pictures