The origins of Frías date back to the
9th century, when Alfonso VIII repopulated the valley to reinforce
the border between Castile and Navarre. The historic quarter preserves
its medieval atmosphere, and urban layout.
On the tallest end of a hill, the castle of the Duke of Frías stands, with 13th-century Romanesque capitals. In the city centre we must point out the church of San Vicente, whose Romanesque main front was taken to New York after the tower fell in 1904, and the convent of Santa María de Vadillo, founded at the beginning of the 13th century. Near the town, crossing the Ebro river, we see a gorgeous medieval bridge, with a defence tower that dates from the 14th century.
Source: Web server of Instituto de Turismo de España, TURESPAÑA.