A manuscript dated 1651 and now housed at the National Library in Florence, Italy, suggests that the document may be the first Italian adaptation of the Spanish drama, "El burlador de Sevilla y Convidado de Piedra" ("The Deceiver of Seville"). The Spanish tragedy, written in 1630 by Gabriel Tellez, known as Tirso de Molina, introduced the character of Don Juan. Four Italian seventeenth century artists are identified as possible dramatists of the Italian version but critics cannot agree on which one of them actually wrote the manuscript, "Convitato di Pietra", under scrutiny. Giacinto Andre Cicognini is alleged to have composed the work in 1650. Giovanni Battista Andreini (1651), Lionne Allacci, and Onofrio Giliberto di Solofra (1652) are also cited as possible authors although the apparent date of their plays follows the publication of the manuscript. A comparison of similarities and differences in the four versions is made. (DS)