Historical clue formulations

• Capital of Qatar — 2026-04-14
• Home of Qatar Airways — 2026-04-05
• Mideast capital — 2025-09-18
• Qatar's capital — 2025-03-04
• World capital since 1971 — 2024-01-19
• Qatar's capital — 2023-12-31
• ___ Amendment (2010s extension of the Kyoto Protocol) — 2023-12-08
• Host city of the 2022 FIFA World Cup — 2023-12-03
• Where Al Jazeera is headquartered — 2023-10-14
• World capital whose Museum of Islamic Art was designed by I. M. Pei — 2023-09-29
• Qatar's capital — 2022-12-20
• Capital of Qatar — 2022-06-26
• Capital of Qatar — 2021-06-13
• Mideast capital — 2020-12-18
• 2022 World Cup venue — 2019-11-16
• Capital of Qatar — 2019-09-24
• Site of the 2022 World Cup — 2019-04-12
• Qatar's capital — 2018-02-01
• Capital of Qatar — 2017-10-29
• Capital of Qatar — 2017-06-14
• Qatari capital — 2017-02-21
• Capital of Qatar — 2015-12-01
• Qatar's capital — 2015-05-04
• Capital of Qatar — 2015-02-10
• Qatar's capital — 2013-05-21
• Qatar's capital — 2012-08-01
• Capital whose name means "big tree" in Arabic — 2011-06-16
• Qatar's capital — 2011-06-05
• Qatari capital — 2011-05-24
• Qatar's capital — 2006-08-02
• Capital east of Riyadh — 2006-04-27
• Qatar's capital — 2003-11-30
• Qatar's capital — 2003-06-25
• Qatar's capital — 2002-11-10
• Qatar's capital — 2001-06-28
• Qatar's capital — 1998-07-05