Kālidāsa
The most popular theory is that Kalidasa flourished during the reign of Chandragupta II, and therefore lived around 4th-5th century CE. Several Western scholars have supported this theory, since the days of William Jones and A. B. Keith. Many Indian scholars, such as Vasudev Vishnu Mirashi and Ram Gupta, also place Kalidasa in this period. According to this theory, his career might have extended to the reign of Kumaragupta I (r. 414 – 455 CE), and possibly, to that of Skandagupta (r. 455 – 467 CE).
Kalisz
Archaeological excavations have uncovered early mediaeval settlement from the Piast dynasty period, c. 9th-12th centuries. Modern Kalisz was most likely founded in the 9th century as a provincial capital castellany and a minor fort. In 1106 Bolesław III Wrymouth captured the town and made it a part of his feudal domain. Between 1253 and 1260 the town was incorporated according to the German town law called the Środa Śląska Law (after Środa Śląska in Silesia), a local variation of the Magdeburg Law, and soon started to grow. One of the richest towns of Greater Poland, during the feudal fragmentation of Poland it formed a separate duchy ruled by a local branch of the Piast dynasty. After Poland was reunited, the town became a notable centre of weaving and wood products, as well as one of the cultural centres of Greater Poland. There are also records of Khalyzian settlements from 1139.