Explanation:

Marco Polo , a Venician Explorer was one of the earliest foreign traveler to visit South India. Towards the Close of the 13th Century he came to Coramandel coastal and Malabar Coastal districts and had given an account of the Pandya Kingdom in his book Travels of Marco Polo [1271 - 1295].
On returning home from China in 1292 CE , He reached Kayal Harbor of Kayalpattinam (Thoothukudi Harbor) which is a Municipality in today’s Thoothukudi , Tamil Nadu
Sundara Pandian and Kulasekara Pandian are the Kings who were ruling south india at that time of his visit.
Marco Polo saw the Kings usually sit only on ground which they consider more honorable.
The Climate is so hot , that all men and women wear nothing but a loin cloth including the king , except he is studded with Rubies , Sapphires , Emeralds and other gems as mentioned by him.
Merchant and Traders abound, the king takes the pride in not holding himself above the law of the land , and people travel the highways safely with their valuables in the cool of the night.
Marco Polo calls the Pandyan Kingdom as “The Richest and most splendid province in the World” , one that , together with Ceylon , Produces most of the gems and pearls that are found in the world.