The Little Ice Age kicked in fast; there was a cold, rainy spring unlike anything in memory or folklore, resulting in famine problems that year and subsequently; farmsteads dating from the medieval warming period are found at higher latitudes and altitudes than are possible now; in Iceland, polar bears appeared, having crossed the ice from Greenland. I like the idea of the LIA beginning with an impact, but haven’t pursued that yet. :’)
there have been several shows on TV about it with scientists from diverse fields contributing.
this one about a Chinese document that noted the event in the sky and that one studying tree rings for growth inhibition.