North’s Plutarch. 1579. First edition.

Shakespeare made more use of this book than perhaps any other, and Halliwell-Phillipps went so far as to assert that “it is one of the books that can positively be said to have been in his own hands.”  North’s translation of Plutarch’s Lives served Shakespeare as resource for his plays Julius Caesar, Anthony & Cleopatra, Coriolanus and Timon of Athens.