The Third Amendment to the Constitution of Rome was the third revision in 1979 of the supreme law under which the government of the Roman Empire operated. The amendment was enacted by Emperor Constantine XXII without the approval of the Roman Imperial Senate. However, the Senate was unable to protest against the amendment due to Constantine's popularity at the time.

Constantine used his popularity to amend the Constitution without the Senate's approval, since the trust placed on him by the people was such that they thought their Emperor was doing what he thought was right. Constantine, in the Third Amendment, stripped the Senate of its legislative powers, placing them instead upon himself. He, in essence, made himself a dictator.

Later, in 1982, Constantine amended the Constitution yet again, abolishing the Senate completely and changing all references to the Emperor to Imperator Supremus - Supreme Emperor. He also established a hereditary monarchy under his family, creating the House of Oltoria.

Upon Constantine's death in 2005 without an heir to replace him, Emergency Regent Antonius Felius, after a Constitutional referendum initiated by himself, in which over eighty percent of the population voted for Constitutional change, repealed the third and fourth amendments.

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