Explanation:

o Fahien (399-412 A.D.) visited India during Chandragupta II Vikramaditya. His accounts give an overview of the administration of Chandragupta Vikramaditya. The prosperity of the empire has been testified by the account of Fa-Hien. The main objective of Fahien's mission to India was to secure copies of Buddhist manuscripts.
o Hiuen Tsang (629-645 A.D) visited the court of Harshavardhana. His accounts give a detailed view of the political, social, economic and religious conditions in India during his reign He records Nalanda University as a post graduate university for advanced study and research.
o Marco Polo (1254-d.1324) - Visited the Kakatiya state under Rudrmadevi. His accounts refers to the polygamy of the kings, the prevalence of Sati, merchants of Gujarat, economic conditions in South India etc.
o Ibn Battuta (1304-77) was a part of the court of Muhammad Bin Tughluq. He wrote the book Rihla where he explained the dynasty of Muhammad-bin-Tughluk and also the economical, social and geographical status of his time.