What is the first name of man that costarred with Clint Eastwood in several movies last was Saunders very rugged looking man?

The actor you're thinking of is Robert Duvall. He starred alongside Clint Eastwood in several films, including:

* Dirty Harry (1971)

* The Outlaw Josey Wales (1976)

* A Perfect World (1993)

Robert Duvall is known for his rugged, weathered look and his powerful performances in both dramas and Westerns.