Answer : 1. "Sardar Vallabhbhai Patel"
Explanation :

The birth anniversary of Sardar Vallabhbhai Patel, the iron man of India, is celebrated on 31 October. Sardar Vallabhbhai Patel is called the iron man of the country. He is called the Iron Man because he had the strength of iron. It was full of national loyalty and devotion to duty. The integration of the princely states after independence is an unmatched example of his determination and administrative acumen.