Night of the Long Knives ca. 450 CE, Salisbury Plain, UK. Oddly,
there is an earlier "Night of the Long Knives" than that of the
Nazis. According to Geoffrey of Monmouth (not the most reliable
of sources, mind you), Vortigern had attempted a peace treaty
with the Saxons that he had originally paid as mercenaries in
order to fight the Picts and Scots. However, the Saxons had
taken to, well, taking the land from the Britons. Vortigern set
up a meeting between the Saxons and British chieftains at a
monastery out on Salisbury Plain. Unfortunately, the Saxons came
armed, and slaughtered 460 British chieftains. The ensuing
violence was called (at least by Geoffrey) "The Night of the
Long Knives." Later, Ambrosius Aurelianus defeats Vortigern and
becomes king. He consults Merlin on constructing a proper
monument for the slain cheiftains. Merlin suggests removing
stones in Ireland, the King's Ring from Mount Killarus, and
bringing them to England. This is the founding of Stonehenge, at
least as far as Geoffrey was co