What if during the Black Plague, or another epidemic, the Europeans either:
1. Fled en masse to the Crusader States or other fringes of Medieval Europe? Mass resettlement there?
2. A refugee fleet sails westwards and lands in Iceland or the New World?
1. Fled en masse to the Crusader States or other fringes of Medieval Europe? Mass resettlement there?
2. A refugee fleet sails westwards and lands in Iceland or the New World?