The following folks died on June 23.
AD 79 – Vespasian, Roman emperor (b. AD 9)
679 – Æthelthryth, English saint (b. 636)
1018 – Henry I, Margrave of Austria
1137 – Archbishop Adalbert of Mainz
1222 – Constance of Aragon (b. 1179)
1290 – Henryk IV Probus, duke of Wrocław and high duke of Kraków (b. c. 1258)
1314 – Henry de Bohun, English knight
1324 – Aymer de Valence, 2nd Earl of Pembroke (b. 1270)
1343 – Giacomo Gaetani Stefaneschi, Italian cardinal (b. c. 1270)
1356 – Margaret II, Countess of Hainaut (b. 1311)
1537 – Pedro de Mendoza, Spanish conquistador (b. 1487)
1565 – Dragut, Ottoman admiral (b. 1485)
1582 – Shimizu Muneharu, Japanese commander (b. 1537)
1615 – Mashita Nagamori, Japanese daimyo (b. 1545)
1677 – William Louis, Duke of Württemberg (b. 1647)
1686 – William Coventry, English politician (b. 1628)
1707 – John Mill, English theologian and author (b. 1645)
1733 – Johann Jakob Scheuchzer, Swiss paleontologist and scholar (b. 1672)
1770 – Mark Akenside, English poet and physician (b. 1721)
1775 – Karl Ludwig von Pöllnitz, German adventurer and author (b. 1692)
1779 – Mikael Sehul, Ethiopian warlord (b. 1691)
1806 – Mathurin Jacques Brisson, French zoologist and philosopher (b. 1723)
1995 – Jonas Salk, American biologist and physician (b. 1914)
1997 – Betty Shabazz, American educator and activist (b. 1936)
1998 – Maureen O'Sullivan, Irish-American actress (b. 1911)
2006 – Aaron Spelling, American actor, producer, and screenwriter, founded Spelling Television (b. 1923)
2015 – Dick Van Patten, American actor (b. 1928)
2016 – Ralph Stanley, American singer and banjo player (b. 1927)
