Which play are Cassius, Portia, and Octavius the characters from?

Cassius, Portia, and Octavius are the characters from the play Julius Caesar written by William Shakespeare.

Cassius was the brother-in-law of Brutus and an acute judge of human nature. He organized the conspiracy against Caesar and employed Brutus by passionate argument.

Portia played the role of a strong and devoted wife of Brutus.

Octavius was the grand-nephew of Julius Caesar. He was named as his heir and adoptive son in Julius Caesar's will.