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While the study of ancient climate change is still a relatively new field, some important data collected from ice-core samples, dendrodata, and archaeological remains point to some significant climatological patterns. These samples suggest that the period that coincided with great Roman imperial development and expansion (100 B.C.E. - 200 C.E.), the period which also saw a massive influx of newly imported, foreign plants, was also one marked by unusual climatological stability, warmer temperatures, and more stable solar activity.