cum occisus dictator Caesar aliis pessimum aliis pulcherrimum facinus videretur
Translation :
when the slaying of Cæsar, the Dictator, seemed to some the vilest, to others, the most glorious of deeds.
Edition :
Annales ab excessu divi Augusti. Cornelius Tacitus. Charles Dennis Fisher. Clarendon Press. Oxford. 1906.
Complete Works of Tacitus. Tacitus. Alfred John Church. William Jackson Brodribb. Sara Bryant. edited for Perseus. New York. : Random House, Inc. Random House, Inc. reprinted 1942.