Bernardino Fernández de Velasco, 6th Duke of Frías

Bernardino Fernández de Velasco, 6th Duke of Frias, Grandee of Spain,[1] (8 February 1609 – 31 March 1652), was a Spanish nobleman and diplomat.

He inherited the title of Constable of Castile and like his father, Bernardino was Governor of the Duchy of Milan between 1647 and 1648.

In 1629, the Duke married Isabel María de Guzmán, with whom he had four children.

He married for a second time with María Enríquez Sarmiento de Mendoza, but they had no issue.

By Isabel María de Guzmán: He had at least one illegitimate son :