Who is Orsino?

Though his title in the play is disputed, Orsino is the ruler of Illyria, with some naval experience behind him. He is lovesick for the Lady Olivia, who will not return his affections; Viola is taken into his service, as the boy Cesario, and is quickly taken into his confidence and tries to woo Olivia for him. However, Orsino's affections shift by the end of the play; he drops his self-indulgent behavior, and develops affection for Viola.

Orinso is the duke of Illyria and he is in love with oliva while oliva is not in love with him