What Roman numeral is King Juan Carlos?
The King of Spain is Juan Carlos I.
Why can't Juan Carlos ever ascend Queen Elizabeth the second even though he is in the line of succession?
Juan Carlos I has been King of Spain since 1975. The King of Spain was baptized Juan Carlos Alfonso Victor Maria de Borbon y Borbon-Dos Sicilias. He was born January 5, 1938 in Rome. He is the Grandson of Alfonso XIII the last King of Spain who was deposed in 1931. Juan Carlos I is the King of Spain.