Though she was seemingly as sweet as any other starlet, everyone in Hollywood knew Margaret Sullavan did things her way, wielding a power that both terrified execs and charmed leading heartthrobs. Yet while she exerted unwavering control over her professional career, her private life was very messy—and ultimately tragic. 1. She Was Born Into MoneyBorn in 1909, Margaret Sullavan made her first appearance in Norfolk, Virginia. On the surface, her childhood seemed charmed: Her father was a wealthy stockbroker, and her parents expected great things of Margaret and her brothers. Yet despite this lu…