Late Antiquity is a historiographical term for the historical period from c. 200 AD to c. 700 AD, which marks the transition from Classical Antiquity to the Middle Ages. Precise boundaries for the period are a matter of debate, but historian Peter Brown proposed a period between the 2nd and 8th centuries. While generally, it can be thought of as from the end of the Roman Empire's Crisis of the Third Century (c. 235 – 284) to the re-organization of the Eastern Roman Empire under Heraclius and the Muslim conquests in the mid-7th century, for the purposes of this page it will be considered the period 200 to 700 AD.