Historical clue formulations

• Creator of Hogwarts [10] — 2017-09-20
• Author of the best-selling book series in history — 2014-02-04
• Creator of the currency system consisting of galleons, sickles and knuts — 2010-10-22
• First person to win a Smarties Prize, for children's books, three years in a row — 2008-03-05
• Author who received an O.B.E. in 2001 — 2002-04-06
• Creator of 35-Across — 2000-08-24