In this setting, the Continent has been hit by several catastrophes, caused by the inner workings of planet's tectonics, and the eruption of a volcano far on the other side of the world. Gravest of them all, the great shroud arose, and the civilization, though not extinct, couldn't sustain highly organized states anymore, thus breaking down into poleis, villages and even solitary estates. This period will engrain itself in the collective consciusness, later being reffered to as the "13 Hells" (13 being the original number of days I intended it to last), and is the source of many superstitions, legends etc.
But - after some consideration, I began to doubt that an event, that lasted only 13 days, would leave such a significant mark in human history. Maybe I'm wrong; anyway, wanted to strech it a bit.
So my question is, what are the medieval civilization's limits to enduring the "Long night"?
- The world, prior to the cataclism, is comparable to Europe's late Medieval Era.
- There's no magic, nor any mythical beings nor properties.
- The Sun isn't completely blocked.
- If possible, the main cause of this darkness would be the eruption of aforementioned far away volcano, located east of the Continent.
- During the period, the life in the mountains (in small, isolated villages) would still be possible, even if arduous. The villagers have good reasons not to descend, though these reasons are currently irrelevant.
- For clarification, not all of humanity has gone up the mountains.
- The mountain range, shown on the picture, peeks at an average of 5000 meters.
- When "Long night" comes to an end, humanity should be able to slowly recover to its former glory.
- If possible, the recovery should last for a couple of centuries.
- This event starts early in the year; late March probably.
- Catastrophies that occured immediately before "Long night" include earthquakes (which weren't highly destructive), and tsunamies (which hit southern and south-eastern coastal towns of the Continent and pretty much levelled them).
I appriciate all the help, cheers.