History: 420's A.D.??

While the origin of 420 is disputed ere are some common theories

1. The number 420 was a radio code used by California law enforcement to describe "smoking in progress..."

2. There is 420 chemicals in a marijuana plant.

3. 4:20 is tea time in Amsterdam

4. April 20th is National Pot Smokers Day.

5. April 20th is Hitler's birthday.

6. April 20th is the date of the Columbine school shootings.

7. Some people celebrate 420 on April 20th others choose to partake at 4:20pm every day

8. The 20th of April is the best time to plant marijuana.

9. Albert Hofmann took the first deliberate LSD trip at 4:20 on 19 April 1943

10. It's the code you send to your drug dealer's pager.

At this time the Roman Empire was split into two factions, the East and West, Visigoths and Vandals There were a series of scuffles between each faction to gain control over lands.

Attila of the Huns pushed German tribes across the Rhine river which put him in a prime position to later attack the western Roman Empire.

Polynesians had developed sufficient nautical skill to sail and colonize Hawaii making this as their most Northern outpost.

Seriously... have you never heard of GOOGLE? or Wikipedia?

http://en.wikipedia.org/wiki/422