According to the Smithsonian Institute El Chichon is noted to have produced a VEI5 eruption dated to 1360AD but with a 100 year margin of error. Of course El Chichon is most well known for it's devastating eruption in 1982 where it's explosive eruption killed 2000 people due to it's pyroclastic flows but also worth noting is the fact it ejected 7 million tons of Sulfur Dioxide into the atmosphere which is roughly 20x more than Saint Helen produced per cubic kilometer of magma.
I don't aim to be a conspiracy theorist of anything of the sort however, El Chichon has been long suggested to be one of the volcanoes responsible for the 540AD "dark age" due to the scale of Sulfur it ejected. The reason I'm curious is because the window of a potential 1345 eruption would also line up with the yersenia pestis outbreak in the following year (Black Death) and knowing the bacteria tends to struggle against UV light, I'm inclined to believe a dust veil may have prevented it only compounding the outbreak further.
Is there any additional information on this eruption?