The beautiful man Rosaline saw was named Romeo. Her heart desired even a single glance at his face more than anything else in the world. She snuck through the town to do so, but found him holding hands with a woman of dazzling beauty. This drove Rosaline mad with jealousy. She had to have Romeo all to herself, and if she needed to use her vast powers to eliminate Juliet, then so be it.
Rosaline is a variant of Rosalind, a name of Old French origin: (hros = "horse", lind = "soft, tender"). When it was imported into English it was thought to be from the Latin rosa linda ("lovely rose").
Rosaline is an unseen character and niece of Capulet in William Shakespeare's tragedy Romeo and Juliet (1597). Although silent, her role is important. Romeo is at first deeply in love with Rosaline and expresses his dismay at her not loving him back. Romeo first spots Juliet while trying to catch a glimpse of Rosaline at a gathering hosted by the Capulet family.