Bhagat Singh ( 28 September 1907 - 23 March 1931 )
He helped organise Punjab Naujawan Bharat Sabha in 1926 and became its founding secretary.
He was the involved in the murder of Mr. Saunders in order to avenge the death of Lala Lajpat Rai.
He re-organised Hindustan Republic Association under the leadership of Chandershekhar Azad and renamed it Hindustan Socialist Republican Association.
He was the author of the famous pamphlet Why I am Atheist.
He once declared before the Lahore High Court "The sword of revolution is sharpened on the whetting stone of ideas."
He alongwith Batukeshwar Dutt threw two bombs in the Legislative Assembly chamber in Delhi against the passage of Public Safety Bill and Trade Disputes Bill.
He was hanged alongwith Rajguru and Sukhdev on Mar 23, 1931 in Lahore Jail.

Chandershekhar Azad ( 23 July 1906 - 27 February 1931 )
Born Chandershekhar Tiwari, he adopted the surname Azad which means free.
He had vowed never to be caught alive by the British.
He was the chief re-organiser of the Hindustan Republican Socialist Association after the death of its founder Ram Prasad Bismil.
He was involved in the Kakori Train Dacoity but managed to evade arrest.
He shot himself dead at the end of an encounter in Alfred Park, Allahabad on 27 Feb 1931.

Udham Singh ( 26 December 1899 - 31 July 1940 )
A patriot from the Punjab, Udham Singh came to London in the 1930s as a fighter against foreign colonial rule in India.
It was Udham Singh who made a pact with death and undertook to execute Michael O'Dwyer, former Governor of Punjab and one of the main perpetrators of the massacre at Jallianwalla Bagh.
On 13 March 1940, he shot O'Dwyer at a public meeting in London.
On 31 July, he was hanged in Pentonville prison.
He made the ultimate sacrifice in defence of the dignity and honour of the Indian people, irrespective of their regional or religious backgrounds, and for this he is remembered as a Shaheed or martyr, immortal in the memory of all freedom-loving peoples of South Asia.

Shivaji ( 19 February 1630 - 03 April 1680 )
He was extremely secular.
He never compromised on his own religious roots and tried reviving all the positive aspects of Hinduism.
He converted his army of 2,000 men into 10,000 soldiers.
He was a practical military commander and didn't encourage his troops to be martyred for the sake of it. Instead, he always asked them to take a step back and regroup.
He defeated Afzal Khan in a one-on-one battle. Afzal Khan was a veteran general and superior to Shivaji in size & strength.
He stood for the honour of women and made sure none were taken prisoners. And naturally rape or molestation was severely punished.
He was extremely merciful to those who surrendered and would welcome them into his own army.
He fought for India first, and then his kingdom.

Babasaheb Ambedkar ( 14 April 1891 - 06 December 1956 )
Independent India's first Law Minister, Dr BR Ambedkar was the architect of the Indian constitution.
Popularly known as Babasaheb, the Indian jurist, politician, economist and social reformer, who was born in 1891 in Mhow, Madhya Pradesh, was known for his campaigns against social discrimination against dalits, women and labour.
Dr. Ambedkar, who had inspired the Modern Buddhist Movement, had died in his sleep on 6 December 1956 at his home in Delhi.