Read here. Depending on the information source, modern "unprecedented" warming is an increase of +0.5 to 0.7 degrees Celsius. Despite the hysteria expressed about this increase by the media and alarmists, in both the historical and ancient past there have been warmings that exceeded the modern warming.
Recently, a prominent climate scientist came across a long forgotten study published back in 1973 that documents the large warmings and coolings that took place in China thousands of years ago. As an example, the long ago Shang Dynasty, which had its capital approximately at the red spot on the map, experienced extended warming that was found to be 2 degrees higher than modern temperatures. The Shang dynasty existed at this location from 1400 BC to 1050 BC. (map source here)
Other warming/cooling phases affecting the Chinese civilization were documented to range from 2 to 3 degrees over multiple periods.
“The world climate during the historical times fluctuated. The numerous Chinese historical writings provide us excellent references in studying the ancient climate of China. The present author testifies, by the materials got from the histories and excavations, that during Yin-Hsu at Anyang, the annual temperature was about 2℃ higher than that of the, present in most of the time. After that came a series of up and down swings of 2—3℃ with minimum temperatures occurring at approximately 100 B. C. (about the end of the Yin Dynasty and the beginning of the Chou Dynasty), 400 A. D. (the Six Dynasties), 1200 A. D. (the South Snug Dynasty), and 1700 A. D. (about the end of the Ming Dynasty and the beginning of the Ching Dynasty). In the Han and the Tang Dynasties (200 B. C.—220 A. D. and 600—900 A. D.) the climate was rather warm." [Chu Ko-Chen 1973: China National Knowledge Infrastructure]
Additional climate-history postings.