A while back, we interviewed Sacha Dobler. His website is abruptearthchanges.com and is chock full of information. His e-book “Black death and Abrupt earth changes in the 14th century” covers the climate, the black death much more historical data from the 14th century. The interesting question it raises is that are illness like the black death connected to these Grand solar minimums. Some of is research says yes… To a degree… Here is the link to his e-book and is highly recommended.