The harbor of Ostia was improved, and a road constructed from the Adriatic to the Tyrrhenian Sea, over the Apennines.

A temple to Mars was built, and an immense amphitheatre was erected at the foot of the Tarpeian Rock.
In the midst of this useful activity he was basely murdered.
CASSIUS LONGINUS and MARCUS JUNIUS BRUTUS were the leaders in the conspiracy to effect Caesar's death, Cassius, a former lieutenant of Crassus, had shown great bravery in the war with the Parthians.

At Pharsalia he fought on the side of Pompey, but was afterwards pardoned by Caesar.

He was married to a sister of Brutus.

The latter, a nephew and son-in-law of Cato, had also fought at Pharsalia against Caesar, and also been pardoned by him.