The black death, also known as the bubonic plague, was one of the most devastating pandemics in human history. It wiped out 30-60% of Europe’s population at that time.
I left the oven stove open!
The Black Death began to spread to Crimea in 1343, and most likely originated from Central Asia. It travelled via the silk road and spread from there.
From there, it was most likely carried by oriental rat fleas living on black rats. These rats were usually found on merchant ships, spreading the disease around Europe and the Mediterranean.
There were several introductions of the disease in Europe other than rats. The plague reached Sicily in 1347, via Galleys from Genoa that carried the disease.
In January 1348, Genoa and Venice contracted the disease from Galleys from Kaffa. An outbreak in Pisa a few weeks later prompted the spread of disease around Northern Italy.
From Italy the Black Death began to really spread, reaching France, Spain, Portugal and England by June 1348, then struck east through Germany and Scandinavia from 1348 to 1350. Northwest Russia was soon infected by 1351.