Read here. Map source. Researchers document that this area of the Himalayas experienced a Roman warming period similar in temperatures to recent modern warming; and, the same area experienced higher than modern temperatures during the Medieval Period.
"The authors developed a relative history of atmospheric warmth and moisture covering the last 1800 years for the region surrounding Paradise Lake -- which is located in the Northeastern Himalaya based on pollen and carbon isotopic (δ13C) analyses of a one-meter-long sediment profile they obtained from a pit "dug along the dry bed of the lakeshore...Bhattacharyya et al. report that their climatic reconstruction revealed a "warm and moist climate, similar to the prevailing present-day conditions," around AD 240 -- which would represent the last part of the Roman Warm Period -- as well as another such period that turned out to be "more warmer 1100 yrs BP (around AD 985) corresponding to the Medieval Warm Period...occurring at times when the atmosphere's CO2 concentration was more than 100 ppm less than it is today."