On January 4, 1980 Colonel Mohamed Khouna Ould Haidalla seized full power in Mauritania, deposing the figurehead head of state Mohamed Mahmoud Ould Louly and becoming president while retaining the premiership, consolidating his position as the country's strongman amid the turmoil left by the Western Sahara war. Haidalla had helped lead the April 1979 coup that reduced President Ould Salek to a figurehead and formed the Military Committee for National Salvation (CMSN); he became prime minister in May 1979 after his co-leader Bouceif died in a plane crash. Louly, who had been installed as nominal head of state in June 1979, held little real power.
On January 4, 1980 Haidalla removed Louly and took the presidency himself. Louly was not physically harmed. Haidalla went on to make peace with the Polisario Front, institute Sharia law, and abolish slavery, before being overthrown himself in 1984.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: Head of state Mohamed Mahmoud Ould Louly, deposed on January 4, 1980 when Haidalla took the presidency; Louly was not physically harmed.
RESEARCHED NAME
Key figures
Mohamed Mahmoud Ould Louly (figurehead head of state deposed)
Mohamed Khouna Ould Haidalla (colonel who took full power)
Sources
A list of coups records that on January 4, 1980 Mohamed Khouna Ould Haidalla overthrew Mohamed Mahmoud Ould Louly in Mauritania.
SOURCE REVIEWEDWikipedia, List of coups and coup attempts by countryopen source ↗
Colonel Mohamed Khouna Ould Haidalla served as head of state of Mauritania from 4 January 1980 to 12 December 1984, and on 4 January 1980 he seized power from Ould Salek's successor as head of state, Mohamed Mahmoud Ould Louly, continuing also to hold the position of prime minister.
Haidalla became prime minister on 31 May 1979, a few days after the death in an airplane crash of the previous prime minister Colonel Ahmed Ould Bouceif, with whom he had seized power for the CMSN just a month earlier from Colonel Mustafa Ould Salek and the CRMN.
Haidalla's tenure was marked by severe political turbulence as Mauritania extracted itself from the war with the Polisario Front started by Ould Daddah in 1975, and his regime faced a number of coup attempts and military intrigues.
Arc link: this January 1980 seizure is the latest stage in Mauritania's post-1978 military turbulence, connecting to the July 1978 coup against Ould Daddah (batch 29) and the April 1979 coup that created the CMSN and reduced Ould Salek to a figurehead (batch 31); Haidalla, a leader of the April 1979 move, now took full power by removing the interim head of state Louly. Fate coding: Louly was deposed and not physically harmed, matching the dataset. Coding note: the dataset labels this a palace coup, accurately, as it was an internal consolidation within the ruling CMSN in which the strongman prime minister assumed the presidency from a figurehead. Context recorded: the whole sequence was driven by the ruinous Western Sahara war; under Haidalla, Mauritania made peace with the Polisario, instituted Sharia law (1980 to 1983), and formally abolished slavery (announced 1980, decreed 1981), recorded as documented later actions. Arc forward: Haidalla was himself overthrown by Maaouya Ould Sid'Ahmed Taya on December 12, 1984, a separate later event.
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: Head of state Mohamed Mahmoud Ould Louly, deposed on January 4, 1980 when Haidalla took the presidency; Louly was not physically harmed..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; not physically harmed. 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
“President of Mauritania Is Reported Overthrown,” January 6, 1980
Milan No citation
Named in the baseline source document; no article citation was recorded.
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 →