Sean Combs, the producer and music mogul who has been one of the most famous names in hip-hop for decades, was sued in federal court on Thursday by Cassie, an R&B singer once signed to his label, who accused Mr. Combs of rape, and of repeated physical abuse over about a decade.

In the suit, filed in Federal District Court in Manhattan, Cassie, whose real name is Casandra Ventura — and who had long been Mr. Combs’s romantic partner — says that not long after she met him in 2005, when she was 19, he began a pattern of control and abuse that included plying her with drugs, beating her and forcing her to have sex with a succession of male prostitutes while he filmed the encounters.