Republic of Tunisia
Who & why: Tunisia gains independence from France in March 1956, and the monarchy is abolished a year later in favor of a republic under Habib Bourguiba. More than five decades later, Tunisia becomes the birthplace of the Arab Spring: the December 2010–January 2011 Tunisian Revolution, triggered by Mohamed Bouazizi's self-immolation in protest of police harassment, forces President Zine El Abidine Ben Ali to flee and sets off a wave of uprisings across the wider Arab world.
What it represents: the same flag adopted in 1831 — red field, white disc, red crescent and star — continues through independence and the 2011 revolution without any design change, formally codified again in the 2014 post-revolution constitution.
Wikipedia: the flag was proclaimed the state flag of the Republic of Tunisia on 1 June 1959 under Article 4 of the constitution, and the Organic Law of 30 June 1999 (adopted 3 July) formalised it for the first time in law. Flags of the World: the national flag was legislated in the Constitution on 1 June 1959, and the current version, with a slightly adapted crescent, was set by the flag law of 30 June 1999 (published 6 July 1999).
- Flag of Tunisia — Wikipedia compiled
- Tunisia — Flags of the World (CRW Flags) compiled
- Tunisian flag law — Flags of the World (CRW Flags) compiled
Not established: The two sources differ on when the design began (Wikipedia 1827 or 1831, FOTW 1835). The 'unchanged since 1831' and the 2014 constitution wording are not covered; both sources say the 1999 law clarified the design, and Wikipedia says the crescent was slightly thinner from 1959 to 1999.