Great travelers and envoys visiting India in ancient and medieval times are Megasthenes, Ptolemy, Fa-Hien, Hiuen-Tsang, I_tsing, Al-Masudi, Al-Beruni, Marco Polo, Dominigo Paes, Nicolo Conti and so on.
Megasthenes, an ambassador of Selecus Nikator, visited Chandragupta Maurya in 3rd centurty BCE.
Ptolemy from Greece visisted India during 2nd Century AD.
Fa-Hien, a pilgrim from China visited during 5th century AD.
Hieuen-Tsang, an envoy visited Hrshavardhana during 7th Century AD.
I-tsing, a Chinese traveler visited Buddist sites in India.
Al-Masudi, an Arab traveler visited India in 10th century AD.
Al-Beruni from Persia came along with Mahmud of Ghazini during the 11th century.
Marco Polo visited India as a foreign envoy during 13th century AD. He visited Rani Rudrama devi's Kakatiya dynasty.
Nicolo Conti a Venetian tourist visited Indai (South). He met Raja Krishna Devaraya of Vijayanagar empire.
Athanasius Nikitin, a Russian merchant visite India during the 15th Century.