The phrase “heavy is the head that wears the crown” is not the only misquote of Shakespeare that is common. According to No Sweat Shakespeare, other popular misquotes include: “Lead on, Macduff,” which is actually “Lay on, Macduff”; “Methinks the lady doth protest too much,” which is “The lady doth protest too much, methinks”; and “Alas, poor Yorick. I knew him well,” which is really “‘Alas, poor Yorick. I knew him, Horatio – a fellow of infinite jest, of most excellent fancy.”

Source: https://www.distractify.com/p/heavy-is-the-head-that-wears-the-crown-origin