From the kings of 753 BC through the Republic, the Principate, the Crisis of the Third Century, Constantine, and the Arab conquests, Rome never stopped being Rome. The three main crises — Arab conquests in the 630s, Seljuk Turk conquest of Asia Minor in the 1070s, and the Fourth Crusade of 1204 — were each swift and devastating, but most of the empire's history was slow, steady economic and territorial growth.