- Medieval Science
- Aristotle
- Roger Bacon (1220-1292)
- Pseudosciences
- Astrology
- Frederick II
- Alchemy
- Eye Glasses
- Mechanical Clock
- 13th Century
- “Little Ice
Age”
- Famine
- Economic Depression
- Plague
- Bubonic
- Pneumonic
- Septicaemic
- Sicily (1347)
- Flagellants
- Anti-Semitism