King Vortigern the usurper sat upon his throne in London, when, suddenly, upon a certain day, ran in a breathless messenger, and cried aloud "Arise, Lord King, for the enemy is come; even Ambrosius and Uther, upon whose throne thou sittest and full twenty thousand with them and they have sworn by a great oath, Lord, to slay thee, ere this year be done; and even now they march towards thee as the north wind of winter for bitterness and haste."