The Trois Glorieuses, the three days of August 13 to 15, 1963, ended the rule of Congo Brazzaville's first president, the ex-priest Fulbert Youlou. Youlou had moved to impose a one-party state and, on the eve of a planned August 13 protest strike, had the principal trade union leaders arrested overnight, transforming the protest into a mass uprising. Soldiers fired on the crowd, killing three trade unionists, and the rallies became riots; by August 14 Youlou's forces were unwilling to defend him, and his appeal to Charles de Gaulle for French military intervention was refused.
On August 15 the army withdrew its support and sided with the unions and the Congolese Youth Union, and Youlou announced his resignation as president, mayor of Brazzaville, and deputy. He was imprisoned in a military camp the evening of his resignation and detained thereafter; the army and unions called Alphonse Massamba-Debat to head a provisional government. Youlou escaped to Leopoldville in March 1965 with his successor's help and was sentenced to death in absentia at a June 1965 trial, dying in exile in Madrid in 1972.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: President Fulbert Youlou, forced to resign on August 15, 1963 after the army sided with the uprising; he was imprisoned the evening of his resignation, held in military camps, fled to Leopoldville in March 1965, and was tried and sentenced to death in absentia in June 1965, jailed, tried, and exiled.
RESEARCHED NAME
Key figures
Fulbert Youlou (deposed president)
Alphonse Massamba-Debat (called to head the provisional government, later president)
The CGAT trade union movement and Congolese Youth Union (drivers of the uprising)
Felix Mouzabakani (army captain, Youlou's nephew, among officers sympathetic to the unionists)
Charles de Gaulle (refused French military intervention)
Sources
The Trois Glorieuses was an uprising from August 13 to 15, 1963 that ended the rule of first president Fulbert Youlou as the trade union movement and Congolese Youth Union struck an alliance with the army; protests by organized workers and unemployed young people angered by Youlou's corruption, pro-French policies, and ultra conservatism turned violent after soldiers opened fire on the crowd, killing three trade unionists, and on August 15 the military withdrew its support from Youlou and sided with the unions, while de Gaulle denied Youlou's request for French military intervention.
SOURCE REVIEWEDWikipedia, Trois Glorieuses (1963)open source ↗
The night before the planned August 13 protest strike at the Brazzaville labour exchange, Youlou had the principal union leaders arrested, transforming the protest into a true anti-governmental action; the unionists secured the sympathy of two army captains including Youlou's nephew Felix Mouzabakani, Youlou's call to de Gaulle for French troops to free the presidential palace failed, and accepting the situation Youlou announced his resignation as president, mayor of Brazzaville, and member of the National Assembly, being imprisoned at a military camp the evening of his resignation.
During the three days of major demonstrations, supported by a part of the army which refused to fire on the demonstrators, President Youlou was forced to resign and the 1961 constitution was abrogated; the army and the unions called Alphonse Massamba-Debat to head the provisional government, and a new constitution was adopted by referendum on December 8, 1963, under which Massamba-Debat became president.
SOURCE REVIEWEDDigitheque de materiaux juridiques et politiques, Universite de Perpignan, constitutional history of Congo Brazzavilleopen source ↗
Youlou was detained after his resignation awaiting trial; he escaped to Leopoldville on March 25, 1965 with the help of his successor Massamba-Debat, and at his trial on June 8, 1965 he was sentenced to death in absentia with his assets nationalized, among the accusations embezzlement of public funds and responsibility for the deaths of three trade unionists on August 13, 1963.
SOURCE REVIEWEDExpeditions Ducret, History of Congo Part 3: Since Independence; corroborated by Wikipedia, Fulbert Youlouopen source ↗
Editorial Note
Popular revolt coding fits: the removal was driven by union led mass protest with the army shifting sides rather than by a military conspiracy, and the dataset's August 15 date is the day of the resignation. The killing of the three trade unionists on August 13 is attributed to soldiers firing on the crowd and is among the charges later laid against Youlou; both points are sourced. Sequence caution for the leader fate: imprisonment came first (1963), escape into exile second (March 1965), and the in absentia trial and death sentence third (June 1965). Arc link: Massamba-Debat was himself forced out in 1968, with Marien Ngouabi emerging.
Cross-Reference
Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.
Identifiers for finding this same event in the other datasets:
Coup Atlas research identifies the target as: President Fulbert Youlou, forced to resign on August 15, 1963 after the army sided with the uprising; he was imprisoned the evening of his resignation, held in military camps, fled to Leopoldville in March 1965, and was tried and sentenced to death in absentia in June 1965, jailed, tried, and exiled..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; arrested or jailed; tried; exiled. The baseline file does not name individual targets; researched names are kept in a separate layer.
Baseline Dataset Citation
Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
“Youlou Forced Out by Brazzaville Mob,” August 16, 1963
“Fear on Youlou’s Fate Sparks Riot Against Brazzaville Regime: Outside Communication With the Former French Congo Cut – Troops on Patrol,” February 8, 1964
This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →