Year (''' MDCCCLXXVII ''') was a Common Year Starting On Monday (link will display the full calendar) of the Gregorian Calendar (or a Common Year Starting On Saturday of the 12-day slower Julian Calendar ).
- July 9 - All England Lawn Tennis And Croquet Club begins its first lawn tennis tournament at Wimbledon .
- July 10 - The then Villa of Mayagüez, Puerto Rico formally receives its city charter from the Royal Crown of Spain .
- July 16 - Great Railroad Strike Of 1877 begins. Riots by Baltimore And Ohio Railroad railroad workers in Baltimore, Maryland lead to a Sympathy Strike and rioting in Pittsburgh, and a full-scale worker's rebellion in St. Louis, briefly establishing a Communist government before President Hayes calls in the armed forces.
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- July 30 - Second battle in the Siege Of Pleven .
- - Near Big Hole River in Montana , a small band of Nez Percé Indians who refused government orders to move to a reservation, clash with the United States Army . The army lost 29 soldiers and Indians lost 89 warriors in a US Army win.
- August 12 - Asaph Hall discovers Deimos , outer Moon of Mars .
- August 17 - Arizona blacksmith F.P. Cahill is fatally wounded by Billy The Kid . Cahill will die the next day, becoming the first person killed by the Kid.
- August 18 - Asaph Hall discovers Phobos , inner Moon of Mars .
- September 1 - Battle Of Lovcha , Third battle in the Siege Of Pleven .
- chief Crazy Horse is Bayonet ed by a United States soldier after resisting confinement in a guardhouse at Fort Robinson in Nebraska .
- January 2 - Slava Raskaj , Croatian painter (d. 1906 )
- February 7 - G. H. Hardy , British mathematician (d. 1947 )
- February 14 - Edmund Landau , German mathematician (d. 1938 )
- February 17 - André Maginot , French politician (d. 1932 )
- February 19 - Gabriele Münter , German painter (d. 1962 )
- February 25 - Erich Von Hornbostel , Austrian musicologist (d. 1935 )
- March 2 - Consuelo Vanderbilt , Duchess of Marlborough (d. 1964 )
- March 4
- --- Alexander Fyodorovich Gedike , Russian composer (d. 1957 )
- --- Fritz Graebner , German ethnologist (d. 1934 )
- --- Garrett Morgan , American inventor (d. 1963 )
- March 16 - Reza Shah Pahlavi , Shah of Iran (d. 1944 )
- March 18 - Edgar Cayce , American psychic (d. 1945 )
- March 25 - Walter Little , Canadian politician (d. 1961 )
- March 29 - Alois Kayser , German missionary (d. 1944 )
- May 3 - Karl Abraham , German psychoanalyst (d. 1925 )
- May 23 - Grace Pearl Ingalls, Née Dow , Youngest sister of author Laura Ingalls Wilder (d. November 10 , 1941 )
- June 4 - Heinrich Otto Wieland , German chemist, Nobel Prize laureate (d. 1957 )
- June 7 - Charles Glover Barkla , English physicist, Nobel Prize laureate (d. 1944 )
- June 11 - Renee Vivien , poet, (d. 1909 )
- June 14 - Jane Bathori , French opera singer (d. 1970 )
- July 2 - Hermann Hesse , German-born writer, Nobel Prize laureate (d. 1962 )
- July 3 - Shafiqah Shasha (شفيقة شعشع), Lebanese-Australian Matriarch (d. 1953 )
- July 6 - Arnaud Massy , French golfer (d. 1950 )
- July 13 - Erik Scavenius , Prime Minister of Denmark (d. 1962 )
- July 17 - Ernst Von Dohnányi , Hungarian conductor (d. 1960 )
- July 19 - Arthur Fielder , English cricketer (d. 1949 )
- August 6 - Wallace H. White, Jr. , U.S. Senator from Maine (d. 1952 )
- August 7 - Ulrich Salchow , Swedish figure skater (d. 1949 )
- August 15 - Stanley Vestal , American writer, poet, historian (d. 1957 )
- August 27 - Ernst Wetter , member of the Swiss Federal Council (d. 1963 )
- September 1 - Francis William Aston , English chemist, Nobel Prize laureate (d. 1945 )
- September 2 - Frederick Soddy , English chemist, Nobel Prize laureate (d. 1956 )
- September 6 - Buddy Bolden , American jazz musician (d. 1930 )
- September 26 - Alfred Cortot , Swiss pianist (d. 1962 )
- October 4 - Razor Smith , English cricketer (d. 1946 )
- October 27 - George Thompson , English cricketer (d. 1943 )
- November 9 - Allama Iqbal , Indian philosopher, Pakistani nationalist, one of the profound founding fathers of the Muslims of India along with Jinnah and National poet of Pakistan (d. 1938 )
- November 15 - William Hope Hodgson , English author (d. 1918 )
- November 22 - Endre Ady , Hungarian poet (d. 1919 )
- November 22 - Joan Gamper , Swiss-born businessman and founder of FC Barcelona (d. 1930 )
- December 3 - Richard Pearse , New Zealand airplane pioneer (d. 1953 )
: ''See also .''
- July 27 - John Frost , British Chartist leader (b. 1784 )
- August 8 - William Lovett , British Chartist leader (b. 1800 )
- August 29 - Brigham Young , American Mormon leader (b. 1801 )
- August 30 - Raphael Semmes , Officer in the USN and the CSN (b. 1809 )
- September 2 - Constantine Kanaris , Greek politician (b. 1795 )
- September 5 - Crazy Horse , Oglala Sioux chief (b. 1849 )
- September 17 - William Fox Talbot , English photographer (b. 1800 )
- September 24 - Saigō Takamori , samurai (b. 1827 )
- October 3 - James Roosevelt Bayley , first Bishop Of Newark, New Jersey , and the eighth Archbishop Of Baltimore (b. 1814 )
- October 16 - Theodore Barrière , French dramatist (b. 1823 )
- November 2 - Friedrich Graf Von Wrangel , Prussian field marshal (b. 1784 )
- December 12 - José De Alencar , Brazilian novelist (b. 1829 )
- December 31 - Gustave Courbet , French painter (b. 1819 )
: ''See also .''
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