>>212027288Antonine Plague started it. As the weather started going crazy it messed up crops around the world which led to weak immune systems and this was the big one 1/10 Romans died they were alive or born For 15 years. 1/5 were dead or crippled by the end. The weather kept getting colder and this was pushing people south and making once fertile places to cold. Grapes could grow in England for instance. Then waves of micro plagues, insect and rodent infestations more plagues it got desperate and boom shit hit the fan.