Answer : 1. "1727 AD"
Explanation :

1. The year of establishment of Jaipur is 1727. This city was founded by Maharaja Sawai Jai Singh II. He was the king of Kachwaha dynasty. Jaipur is also known as the "Pink City".

2. There were many reasons behind the establishment of Jaipur. The most important reason was that Maharaja Sawai Jai Singh II had to shift the capital of his kingdom to a safer place. Jaipur was located in a secure location and was also a prosperous trading centre.