The First Amendment to the Constitution of Rome was the first revision of the Constitution of Rome, the supreme law under which the Roman Empire operates. It was responsible for establishing the elective monarchy system that is now prevalent in the Roman Empire.

The 1855 Amendment was replaced in 1856 by the Second Amendment to the Constitution of Rome. Several years after the ascension of Constantine XXII, he amended the constitution twice, producing the third and fourth amendments to the constitution, which stripped the Imperial Senate of its powers, then abolished it completely. The Fourth Amendment also reestablished a hereditary monarchy under Constantine's family, which was to be known as the Oltorian dynasty. However, Constantine became critically ill in the early 1990s, leaving Antonius Felius as Regent, de facto becoming Emperor. Constantine died before he could produce an heir.

After the death of Constantine XXII, Felius re-established the Senate and, after a national referendum, repealed the third and fourth amendments.

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