Historical clue formulations

• Capital of Oman — 2026-06-01
• Variety that shares its name with a Mideast capital — 2024-02-18
• Capital on the Arabian Peninsula — 2022-10-23
• Capital of Oman — 2021-05-11
• Where Oman Air is headquartered — 2016-01-12
• Gulf of Oman port — 2012-03-25
• Grape variety — 2000-11-10
• Sweet grape used in winemaking — 2000-08-17