On December 12, 1984 Colonel Maaouya Ould Sid'Ahmed Taya seized power in Mauritania in a bloodless coup while the head of state, Colonel Mohamed Khouna Ould Haidalla, was out of the country, beginning a rule that would last more than twenty years. Haidalla had led Mauritania since taking power in January 1980 and had survived several coup attempts, but his rule was marked by turbulence over the Western Sahara war and internal rivalries. Taya, a career officer who had served as army chief of staff and as prime minister under Haidalla, moved against him on December 12, 1984 while Haidalla was returning from a Franco-African summit in Burundi.
Taya declared himself chairman of the Military Committee for National Salvation. Haidalla, who learned of the coup during his return, was detained.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: Colonel Mohamed Khouna Ould Haidalla, overthrown on December 12, 1984 by Taya while abroad; he was held in administrative detention for several years.
RESEARCHED NAME
Key figures
Mohamed Khouna Ould Haidalla (head of state overthrown)
Maaouya Ould Sid'Ahmed Taya (colonel who seized power)
Sources
On 12 December 1984, while Haidalla was out of the country, Ould Taya seized power and declared himself Chairman of the Military Committee for National Salvation, having previously been appointed Chief of Staff of the Army in July 1980 and Prime Minister in April 1981 during Haidalla's rule.
On December 12, 1984 Taya ousted Mohamed Khouna in a coup while the latter was out of the country, having been at a Franco-African Summit in Burundi, and Mohamed Khouna learned of the coup in Brazzaville during his return to Mauritania from Denis Sassou Nguesso, the president of the Republic of the Congo.
After returning to Mauritania in late 1984, Mohamed Khouna was held in administrative detention for several years by Ould Taya, during which time he fell sick, and after his release he stayed outside politics until 2003.
Maaouya Ould Sidi Ahmed Taya took over the presidency and the office of prime minister from Ould Haidalla in a bloodless coup, and Mauritania renewed diplomatic ties with Morocco in 1985, seeking again to resolve the dispute in Western Sahara.
SOURCE REVIEWEDBritannica, Maaouya Ould Sidi Ahmed Tayaopen source ↗
Editorial Note
Fate coding: the deposed head of state Mohamed Khouna Ould Haidalla was held in administrative detention for several years after the coup, matching the dataset's arrested-or-jailed fate; he was not physically harmed and later returned to opposition politics. Coding note: the dataset labels this a military coup, accurately, a bloodless seizure by Colonel Taya, who had been Haidalla's own army chief and prime minister, while Haidalla was abroad. Arc link: this continues the Mauritanian coup sequence this enrichment has tracked, following Haidalla's own January 1980 seizure of power (enriched in an earlier batch); Mauritania had cycled through several military rulers since the 1978 overthrow of the founding president Ould Daddah. Trigger recorded: sources note Haidalla's 1984 recognition of the Sahrawi Arab Democratic Republic as a triggering cause, alongside the broader instability of the Western Sahara war and internal rivalries. Historical weight recorded: Taya went on to rule for 21 years, introducing multiparty elections in 1992, before being himself overthrown in a 2005 coup while abroad, later context; later human-rights abuses under his rule are documented separately.
Cross-Reference
Datasets agree. At least two of the three reference datasets we check against carry this event, and none of them disagrees about its date or its result.
Identifiers for finding this same event in the other datasets:
Coup Atlas research identifies the target as: Colonel Mohamed Khouna Ould Haidalla, overthrown on December 12, 1984 by Taya while abroad; he was held in administrative detention for several years..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; arrested or jailed. 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
“Mauritania Coup Ousts President,” December 13, 1984
“AROUND THE WORLD; Mauritania’s President Arrested by Coup Leader,” December 14, 1984
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 →