Plutarch. Plutarch's Lives of the Noble Grecians and Romans
Englished by Sir Thomas North. Trans. Sir Thomas North. Vol. 6 (1579; London: David Nutt, 1896) 195.

     side under his long gowne, that no bodie sawe nor knewe,MARCUS
     but his wife onelie. The other conspirators were all assembled  BRUTUS
     at Cassius house, to bring his sonne into the market place,
     who on that day did put on the mans gowne, called Toga
     Virilis: and from thence they came all in a troupe together
     unto Pompeys porche, looking that Caesar woulde straight
     come thither. But here is to be noted, the wonderfullThe wonder-
     assured constancie of these conspirators, in so daungerousfull constancy
     and waightie an enterprise as they had undertaken. Forof the con-
     many of them being Praetors, by reason of their office, whosespirators, in
     duetie is to minister justice to everie bodie: they did notkilling of
     onelie with great quietnesse and curtesie heare them thatCaesar.
     spake unto them, or that pleaded matters before them, and
     gave them attentive eare, as if they had had no other matter
     in their heades: but moreover, they gave just sentence, and
     carefullie dispatched the causes before them. So there was
     one among them, who being condemned in a certaine summe
     of money, refused to pay it, and cried out that he did appeale
     unto Caesar. Then Brutus casting his eyes uppon the con-
     spirators, sayd, Caesar shall not lette* me to see the lawe
     executed. Notwithstanding this, by chaunce there fell outSundrie mis-
     many misfortunes unto them, which was enough to havefortunes to
     marred the enterprise. The first and chiefest was, Caesarshave broken
     long tarying, who came verie late to the Senate: for bicauseof the enter-
     the signes of the sacrifices appeared unluckie, his wife Cal-prise.
     purnia kept him at home, and the Soothsayers bad him
     beware he went not abroade. The seconde cause was, when
     one came unto Casca being a conspirator, and taking him by
     the hande, sayd unto him: O Casca, thou keptest it close
     from me, but Brutus hath tolde me all. Casca being amazed
     at it, the other went on with his tale, and sayd: Why, howe
     nowe, howe commeth it to passe thou art thus riche, that
     thou doest sue to be Ædilis? Thus Casca being deceived
     by the others doubtfull wordes, he tolde them it was a
     thowsand to one, he blabbed not out all the conspiracie.
     An other Senator called Popilius Laena, after he had saluted
     Brutus and Cassius more frendlie then he was wont to doe:
     he rounded softlie in their eares, and told them, I pray
     the goddes you may goe through with that you have taken