President Ram Nath Kovind, Vice President M Venkaiah Naidu and Prime Minister Narendra Modi today paid tributes to Sardar Patel on his birth anniversary. In a tweet, Mr Kovind said, Sardar Patel, forged the unity and integrity. The President said India will forever remember the Iron Man of India's services to the nation. <br />'' <br />''Mr Naidu said, looking at the political perspective of that time, Sardar Patel's integration of India by merging 562 kingdoms was more significant historical event then integration of Germany by Bismarck or integration of Italy Geribaldi. Mr Modi said, the nation bows to the great Sardar Patel, the stalwart who unified India and served the nation tirelessly.<br />''<br />''<br />