Stefano DiMera is a fictional character from the American soap opera Days of Our Lives. He is known for being a powerful and cunning businessman, often involved in various criminal activities. Stefano is portrayed as a master manipulator, using his intelligence and resources to achieve his goals, which often puts him at odds with other characters. Created by writer William J. Bell, Stefano first appeared in the show in 1982. He is the patriarch of the DiMera family, which has a significant impact on the series' storylines. His character has been played by several actors, most notably Joseph Mascolo, who brought depth to Stefano's complex personality.