Question

Who were Sebastian and Viola? How were they shipwrecked?

Chapter-Twelfth Night ​

Answer 1

Answer:

Sebastian is the twin brother of Viola.

After the beginning of the play, Viola mentions that her brother Sebastian is drowned in the sea. The next appearance of Sebastian denies this, as he has been rescued by Antonio, a sea Captain who looks after Sebastian at some risk to himself.

Answer 2

Answer:

 A shipwreck (Act 1, Scene 2) A shipwreck strands Viola on the shores of Illyria and she believes that her identical twin brother, Sebastian, is drowned. She persuades the captain of the ship to dress her as a man and present her as a servant to Orsino.