Historical clue formulations

• Sultanate on the island of Borneo — 2024-09-12
• Sultanate just north of the Equator — 2024-06-16
• Oil-rich land ruled by a sultan — 2015-03-15
• Country that calls itself the "Abode of Peace" — 2014-03-13
• It borders the South China Sea — 2012-03-16
• Pacific sultanate — 2010-09-06
• The Abode of Peace — 2002-06-16
• Sultanate on the South China Sea — 1997-11-09
• Country on Borneo — 1995-05-28