which historic figure would a historian study if they wanted to locate a primary source with negative depiction of the effects of the Mongol Empire in Europe?

One historic figure that a historian might study to locate a primary source with a negative depiction of the effects of the Mongol Empire in Europe is Friar Giovanni da Pian del Carpine. He was an Italian Franciscan friar and diplomat who was sent by Pope Innocent IV as an envoy to the Mongol Empire in the mid-13th century. Friar Giovanni documented his journey in a travelogue called "Historia Mongalorum," or "The History of the Mongols."

In this primary source, Friar Giovanni depicted the devastating effects of the Mongol invasions on various European regions. He described the Mongols' ruthlessness, destruction of cities, plundering, and massacres, highlighting the negative impact they had on local populations and their way of life. His account provides valuable insight into the negative consequences of the Mongol Empire in Europe during that period.