Italian author whose writings are a primary source of information about 16th-century theatrical production in Italy.

Sommo wrote the first known Hebrew drama, Tzaḥut bediḥuta de-qiddushin (1550; “An Eloquent Comedy of a Marriage”), in which characters such as the pining lover, the comic servant, and the crafty lawyer reflect the influence of the Italian commedia dell'arte. Sommo's experience as a playwright and producer of dramas for various noble patrons was the basis for his Dialoghi in materia di rappresentazioni sceniche (c. 1565; Dialogues on the Art of the Stage), a summation of contemporary theatre practice containing one of the earliest extant discussions of stage lighting. It gives directions on the use of small reflectors to intensify lighting, the importance of dimming house lights, and the expressive use of lighting to create mood.