Fray Gabriel TUllez, who wrote under the pen-name of Tirso de Molina, is the third great dramatist (with Lope de Vega and Calder3/4n) of the 17th century Spanish theatre. If Lope heads all the rest for sheer inventive vitality and Calder3/4n for well-wrought poetic and intellectual substance, Tirso is supreme as a creator of character.