page_title: 1866
section_title: April–June
hierarchical_section_title: 1866 / Births / April–June
caption_attribution_description: Deutsch: Anne Sullivan Macy, Lehrerin von Helen Keller
context_page_description: 1866 was a common year starting on Monday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1866th year of the Common Era and Anno Domini designations, the 866th year of the 2nd millennium, the 66th year of the 19th century, and the 7th year of the 1860s decade. As of the start of 1866, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
context_section_description: April 1
  William Blomfield, New Zealand cartoonist (d. 1938)
  Ferruccio Busoni, Italian pianist and composer (d. 1924)
  April 3 – J. B. M. Hertzog, Boer General and 3rd Prime Minister of South Africa (d. 1942)
  April 8 – Alfred Allen, American actor (d. 1947)
  April 12 – Zainal Abidin III, Sultan of Terengganu (d. 1918)
  April 13 – Butch Cassidy, American outlaw (k. 1909)
  April 14 – Anne Sullivan, American tutor of Helen Keller (d. 1936)
  April 17 – Ernest Starling, English physiologist (d. 1927)
  April 21 – Josefa Toledo de Aguerri, Nicaraguan pioneer educator (d. 1962)
  April 22 – Hans von Seeckt, German general (d. 1936)
  April 24
  Claude C. Hopkins, American advertising executive (d. 1932)
  Ishii Kikujirō, Japanese diplomat (d. 1945)
  April 30 – Mary Haviland Stilwell Kuesel, American pioneer dentist (d. 1936)
  May 5 – Thomas B. Thrige, Danish industrialist (d. 1938)
  May 10
  Richard H. Jackson, four-star admiral (d. 1971)
  Constance Piers, Canadian journalist, poet and editor (d. 1939)
  May 17 – Erik Satie, French composer (d. 1925)
  May 22 – Charles F. Haanel, American New Thought author and businessman (d. 1949)
  June 4 – Miina Sillanpää, Finnish politician (d. 1952)
  June 26
  George Herbert, 5th Earl of Carnarvon, English financier of Egyptian excavations (d. 1923)
  Josef Swickard, German actor (d. 1940)
  June 29 – Bartholomeus Roodenburch, Dutch swimmer (d. 1939)
caption: Anne Sullivan
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