Son of Don Arias Gonzalo.

• Book III Chapter VII:

  Then Don Arias Gonzalo called for another son, whose name was Diego Arias, and said unto him, To horse! and go fight to deliver this Council and to revenge the death of your brother: and he answered, For this am I come hither.

• Book III Chapter VII:

  And at length Diego Arias received such a blow near the heart that he fell dead.