MWP - Medieval Warm Period ends

In the 14th century, four centuries of mild weather came to an abrupt halt in Europe. Famine and frigid temperatures ensued, and roughly 10 percent of the population died

Long before the bitter cold winters and drenching rains of the early 14th century announced the end of the Medieval Warm Period (MWP), Europe had expanded dangerously close to the limits of its resources. Four centuries of unusually mild temperatures (the highest in 8,000 years), prompted the continent’s farmers to plant crops on vast quantities of land previously unsuitable for agriculture; the increased food supply in turn fueled a population explosion that tripled the number of people in medieval Europe.

Little Ice Age - Medieval cooling, famine, plague, social change