The Duchy of Arión Historical milestone · Casasola de Arión, Montes Torozos, Valladolid Image of Casasola de Arión, not of the place itself. The Dukedom of Arión is a noble title with grandeeship of Spain that Philip V granted on 20 September 1725 to Baltasar de Zúñiga y Guzmán, 2nd Marquis of Valero and former viceroy of Sardinia, Navarre and New Spain. The dignity was created over the towns of Casasola and Morales, which Zúñiga held through maternal inheritance; the first, until then simply Casasola, was renamed Casasola de Arión. Unmarried and childless, he founded an entail that, after several successive shifts, brought the title to María Teresa Pacheco, sister of the 13th Duke of Frías, in whose descendants it has continued. The dukes exercised their manorial rights in Arión and Morales until the abolition of manorial lordships in 1837. The duke's house preserves a 16th-century wrought-iron grille and a coat of arms bearing the cross of Calatrava. 1725 Photo: Fundación Joaquín Díaz (CC BY-SA 3.0) What to see and do in Casasola de Arión