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Source

The principal source for the story is Plutarch's "Life of Mark Antony" from Lives of the Noble Grecians and Romans Compared Together, in the translation made by Sir Thomas North in 1579. A large number of phrases within Shakespeare's play are taken directly from North's prose, including Enobarbus's famous description of Cleopatra's barge, beginning "The barge she sat in, like a burnished throne/Burned on the water." However, Shakespeare also adds scenes, including many of the ones portraying Cleopatra's domestic life, and the role of Enobarbus is greatly developed. Historical facts are also sometimes changed: in Plutarch Antony's final defeat was many weeks after the battle of Actium, and Octavia lived with Antony for several years and bore him one child.