1803, 23rd September – Second Anglo-Maratha War: The Battle between the British East India Company and the Maratha Empire in India.
1846, 23rd September – Urban Lee Warrier discovered the planet Neptune. It is the first planet to be discovered by mathematical arithmetic.
1905, 23rd September – Norway and Sweden, previously united, decided to secede through the Karlstad Agreement.
1908, 23rd September – Establishment of the University of Alberta in Canada.
1932, 23rd September – The Hejaz and Nejd kingdoms have renamed the Kingdom of Saudi Arabia.
1974, 23rd September – The world’s first Ceefax Teletext service began on BBC television in Britain.
2002, 23rd September – The first version of the Mozilla Firefox browser released.
2010, 23rd September – The world’s biggest wind farm was inaugurated off the UK coast in Thanet, Kent.
63 BC – Gaius Octavius Caesar, first Roman emperor, the adopted son and heir of Julius Caesar.
1215 – Kublai Khan, the Mongol emperor.
1819 – Armand Hippolyte, French physicist who first measured the speed of light.
1861 – Robert Bosch, founder of the Bosch Company.
1892 – Syed Ata Ullah Shah Bukhari, a Muslim Hanafi scholar, religious and political leader from the Indian subcontinent.
1903 – Yusuf Meher Ali, a socialist leader, and freedom fighter.
1908 – Ramdhari Singh Dinkar, a patriot and Hindi poet. He is considered one of the most important modern Hindi poets.
1911 – Rappal Sangameshwar Krishnan, an Indian physicist.
1917 – Asima Chatterjee, an Indian chemist.
1935 – Prem Chopra, Indian actor.
1943 – Tanuja, Indian actress.
1950 – Dr. Abhay Bang, Indian Sociologist. He predominantly works for the upliftment of Adivasi people in Maharashtra state.
1957 – Kumar Sanu, Indian playback singer. He is famous for singing thousands of Bollywood songs.
1858 – Grant Duff, a British soldier and historian from Scotland who wrote the history of the Marathas.
1870 – Prosper Mérimée, French writer, historian, and archaeologist.
1882 – Friedrich Wohler, German chemist. He was the first to isolate the chemical elements beryllium and yttrium in pure metallic form. He was the first to prepare several inorganic compounds including silane and silicon nitride.
1939 – Sigmund Freud, an Austrian neurologist and the founder of psychoanalysis. Considers as the father of modern psychology.
2004 – Dr. Death of Raja Ramanna, Indian scientist, 4th Chairman of the Atomic Energy Commission.
23-September-1743
Sawai Jaising died.
23-September-1803
British-Indian forces defeated the Marathas in the Battle of Assaye.
23-September-1858
Grant Duf, historian who studied Maratha history, died.
23-September-1862
Sriniwas Shastri, great patriot and veteran politician, was born.
23-September-1863
Rao Tularam Singh Yadav, freedom fighter, was one of the key leaders of the Indian rebellion of 1857, in Haryana, where he is considered a state hero.
23-September-1903
Yusuf Meherali, freedom fighter and socialist, was born.
23-September-1906
Kumar (Mijjan) alias Syed Hasan Ali, film actor, was born in Lucknow, Uttar Pradesh. He has worked in 'Shadows of the Dead', 'Dukhiari', 'Gambler', 'Patan ni Paniari', 'Thoure of Delhi'.
23-September-1908
Ramdhari Singh Dinkar, famous Hindi poet, was born.
23-September-1911
Rappal Sangmeshwar Krishnan, noted physics expert of India, was born.
23-September-1952
Anshuman Dattajirao Gaekwad, batsman in 40 Tests (1974-85), was born in Bombay.
23-September-1965
The Indian Army secured the Kashmir Valley and the only object left was to clean out the remnants of the Gibraltar Force. Under the guidance of United Nations, the cease-fire came into effect.
23-September-1967
P. S. Vaidya, great Indian ODI pace bowler (1995-96), was born.
23-September-1974
First NCC Airforce Squadran (Women) was established at Vanasthali Vidyapeeth, Rajasthan.
23-September-1980
Indira Gandhi gains power to imprison without trial.
23-September-1983
Supreme Court upholds execution of criminals through hanging by rope.
23-September-1990
World Bank clears Rs.1,200 crore aid for Sarovar Dam rejecting objections raised by environmental groups.
23-September-1992
Indian-designed pilotless target aircraft 'Lakshya' successfully tested.
23-September-1996
Sitaram Kesri elected provisional president of Congress (I).
23-September-1997
India win Sahara Cup Cricket series by 4-1 victory over Pakistan.
23-September-1999
India rejects Pakistan's proposal for an international conference on arms control.