The purpose of this timeline is not to list all major events in the history of the trombone as an instrument, but instead to contextualize major events in the history of the trombone with major events in the musical world and world history.
1439: Gutenberg Printing Press invented
1468: First mention of the trombone in descriptions of the wedding of King Charles the Bold to Margaret of York
1756: Birth of Wolfgang Amadeus Mozart
1763: Wagenseil Trombone Concerto composed
1776: Signing of the Declaration of Independence
1804-1808: Beethoven Symphony #5 composed
1830: Premier of Symphonie Fantastique
1837: David Trombone Concertino composed
1839: First patent for a trombone F-attachment valve filed
1861: Start of the American Civil War
1870: Birth of Arthur Pryor
1913: Premier of Rite of Spring
1914: Archduke Franz Ferdinand assassinated, marking the start of WWI
1924: Premier of Rhapsody in Blue
1924: Grondahl Trombone Concerto composed
1941: Attack on Pearl Harbor
1941: Hindemith Trombone Sonata composed (the first sonata composed for trombone)
1956: Tomasi Trombone Concerto composed
1963: Assassination of John F. Kennedy
1966: Berio Sequenza V composed