Final answer:
William Shakespeare wrote the play about King Richard III, and he was a key figure in the English Golden Age of Theatre.
Step-by-step explanation:
The play about King Richard III was written by none other than William Shakespeare, a renowned playwright, actor, and later, a business partner in the Lord Chamberlain's Men, which was later renamed the King's Men. Shakespeare's contribution to the Golden Age of Theatre, along with other distinguished playwrights like Christopher Marlowe and Thomas Kyd, positioned him as an unrivaled master of language in English theatre.
Richard III is one of Shakespeare's most famous historical plays, noted for its complex portrayal of the king and its rich poetic language. By the time the play was published, Shakespeare's name had become a significant selling point and was prominently featured on the title pages of his plays.