The object of this study is to show the character of the Marques de Bradomin as portrayed in the Sonatas of Ramon del Valle-Inclan, and, since the Marques fancies himself a Don Juan, to compare his traits with those of the Don Juan Tenorios of Tirso de Molina and Jose Zerilla. The Don Juan traits of each of the characters will be discussed according to three concepts: first, his lack of respect for religion and the church; second, his disregard for the rights of others; and third, his conquest of women. Other factors that will be discussed are: appearance, boastfulness, veracity, pride, affluence, nobility, courage, aggressiveness, nationality and sentimentality. Once each character has been treated in terms of the above-mentioned traits, a comparison of the three personalities will be made, Our conclusions will then be based on the following three considerations: first, the ambiance to which each Don Juan belongs; second, the characteristics which are common to all three personages; and third, the ways in which the three men differ.