Historical clue formulations

• Chinese dynasty — 2023-12-10
• Chinese dynasty during which trade with Portugal began — 2009-04-10
• "Flash Gordon" villain ___ the Merciless — 2005-07-10
• Like some vases — 2005-03-05
• Merciless one — 1999-01-03
• Like some vases — 1998-05-24
• Chu Yüan-chang's dynasty — 1998-05-23
• Chinese dynasty — 1996-05-27
• Like some vases — 1995-08-27
• Flash Gordon villain — 1995-03-23
• Flash Gordon's foe — 1994-08-21
• Chinese dynasty, 1368-1644 — 1994-05-01