Viola
Viola washes ashore in Illyria (the Dalmatian coast, across the Adriatic from Italy). She has heard of Duke Orsino, and disguises herself as a man to work for him.
1. The Duke is in love with Olivia.
2. Viola is dressed as a man and therefore cannot express her woman’s love for the Duke.
3. To remain his servant, she cannot reveal her true rank.