Plutarch, Caesar
Bernadotte Perrin, Ed.

64. But at this juncture Decimus Brutus, surnamed Albinus, who was so trusted by Caesar that he was entered in his will as his second heir, but was partner in the conspiracy of the other Brutus and Cassius, fearing that if Caesar should elude that day, their undertaking would become known, ridiculed the seers and chided Caesar [2] for laying himself open to malicious charges on the part of the senators, who would think themselves mocked at; for they had met at his bidding, and were ready and willing to vote as one man that he should be declared king of the provinces outside of Italy, and might wear a diadem when he went anywhere else by land or sea; [3] but if some one should tell them at their session to be gone now, but to come back again when Calpurnia should have better dreams, what speeches would be made by his enemies, or who would listen to his friends when they tried to show that this was not slavery and tyranny? But if he was fully resolved (Albinus said) to regard the day as inauspicious, it was better that he should go in person and address the senate, and then postpone its business. [4] While saying these things Brutus took Caesar by the hand and began to lead him along. And he had gone but a little way from his door when a slave belonging to some one else, eager to get at Caesar, but unable to do so for the press of numbers about him, forced his way into the house, gave himself into the hands of Calpurnia, and bade her keep him secure until Caesar came back, since he had important matters to report to him.