Historical clue formulations

• Duke of ___, title for Prince Harry — 2022-08-01
• English county that's home to Brighton — 2020-05-17
• Kingdom next to Kent — 2013-11-15
• Area where the hoax Piltdown man was found — 2010-04-23
• Piltdown man locale — 2009-03-13
• Northernmost county in New Jersey — 2008-08-21
• Domestic chicken breed — 2008-07-05
• Cattle or chicken breed — 2000-11-03
• Kind of spaniel — 1999-06-25
• Site of the Piltdown man hoax — 1994-06-05