Perhaps this will further explain:
Amphitryon was the title of a lost tragedy of Sophocles, but most dramatic treatments are comic. Plautus, the Roman comedian, used this tale to present a burlesque play, similar to the later Aristophanic stories except with a tragic side. The episode of Zeus and Alcmene similarly forms the subject of comedies by Cam�es and Moli�re. From Moli�re's line "Le v�ritable Amphitryon est l'Amphitryon o� l'on d�ne," the name Amphitryon has come to be used in the sense of a generous entertainer, a good host; the Spanish word for "host" is in fact "anfitri�n".