(Source: Wikipedia): Twelfth Night, or What You Will is a comedy by William Shakespeare, named after the Twelfth Night holiday
of the Christmas season. It was probably written in 1600 to 1601; the
name of its male lead, Orsino, was probably suggested by that of
Orsini, Duke of Bracciano, an Italian nobleman who visited London in
the winter of 1600 to 1601.