About Patan
Patan, an ancient fortified city, was founded in 745 AD by Vanraj Chavda, the most prominent king of the Chavda Kingdom. He named the city "Anhilpur Patan" or "Anhilwad Patan" after his close friend and Prime Minister Anhil Gadariya. It is a historical place located on the bank of Saraswati River. Patan was established by the Chapotkata ruler Vanaraja in 8th century as "Anahilapataka". During 10th-13th century, the city served as the capital of the Chaulukyas, who supplanted the Chapotkatas. Historian Tertius Chandler estimates that Anhilwara (Patan is built on this ancient city) was the tenth-largest city in the world in the year 1000, with a population of approximately 100,000.
Source : Wikipedia