[401-450] [ Verified · Method ]

: Roman troops officially withdrew from Britain, leaving the region to be settled by Anglo-Saxons and leading to a period of economic and cultural decline.

In modern usage, "401–450" frequently appears in specific administrative and regulatory frameworks. 401 Area Code - Location map, time zone, and phone lookup [401-450]

: The massive fortification of Constantinople that protected the city for over a millennium. : Roman troops officially withdrew from Britain, leaving

: The Visigoths, led by Alaric , sacked Rome for the first time in 800 years, signaling the empire's vulnerability. : The Visigoths, led by Alaric , sacked

: By 450 AD, the Huns had become a dominant force. A famous incident involved Honoria, sister of Emperor Valentinian III, sending an engagement ring to Attila the Hun, effectively inviting him to invade the West. Modern Technical & Regulatory Contexts