There are numerous mentions of the Mongols in the writings of virtually all Polish chroniclers, notably Jan Długosz. From the 15th to the 18th centuries, Mongolian affairs were connected or identified in Poland directly with the severe devastation wrought on the country by the Mongol invasions from late 1240 to 1241, then again in 1259–1260 and in 1287–1288. Mongol tumen under Orda Khan devastated most of central Poland, besieged and sacked Lublin, Sandomierz, Wolbórz, Łęczyca, then turned south towards Sieradz and Wrocław. All the while, the armies of Baidar and Kadan ravaged the southern part of Poland including Chmielnik, the royal city of Kraków, Bytom, Opole, Legnica and others. Panic spread through the Polish lands. In 1259, mere 18 years after the first attack, two tumens of 40,000 men from the Golden Horde under the leadership of Berke, attacked Poland again. Most towns in Galicia and Volhyinia were burned to the ground. The Rus soldiers under Daniel's son, Lev, and brother, Vasily, joined the Mongol expedition. Here's where the Mongolian affairs became connected and identified in Poland with the Tatar issues. More death and destruction was unleashed on the cities of Lublin, Sieradz, Sandomierz, Zawichost, Kraków and Bytom. The Golden Horde remained very important in the literary tradition of Poland dating back to the Middle Ages. It inspired such works as a treatise on the origin of the Tatars by Mikołaj Rozembarski (1499).