Hamlet -- Borrowed, Crawled and Pythoned On this day in 1602 printer James Robertes entered in the Stationers' Register, "A booke called the Revenge of Hamlett Prince Denmarke as yt was latelie Acted by the Lord Chamberleyne his servants." Sources for Shakespeare's plot go back to an 11th century text entitled "Amleth"; going the other way, one web site lists 150 book titles based on lines from the "To be or not to be" soliloquy.