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Despite much literary detective work, the exact year of writing remains in dispute. Three different early versions of the play have survived: these are known as the First Quarto (Q1), the Second Quarto (Q2) and the First Folio (F1). Each has lines, and even scenes, that are missing from the others. Shakespeare probably based Hamlet on the legend of Amleth, preserved by 13th-century chronicler Saxo Grammaticus in his Gesta Danorum and subsequently retold by 16th-century scholar François de Belleforest, and a supposedly lost Elizabethan play known today as the Ur-Hamlet.