Coup Atlas Research Database
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43312171962AttemptedPalace coup

Senegal, 1962 — palace coup attempt

Senegal (SEN)West Africa, AfricaDecember 17, 1962

Event Summary

On 17 December 1962 Senegal was plunged into a constitutional crisis when Prime Minister Mamadou Dia, at odds with President Leopold Sedar Senghor over economic policy and the direction of the newly independent state, ordered gendarmes to occupy the National Assembly and arrested four deputies to block a motion of no confidence against his government. The deputies, denied access to the assembly building, instead met at the home of assembly president Lamine Gueye and passed the censure motion. Senghor, who had already alerted the army, prevailed as the gendarmerie and police placed themselves under his direct orders and paratroopers secured Radio Senegal.

Dia, abandoned by his few supporters, was arrested the next day. Tried for attempting a coup, he was sentenced to life imprisonment, serving twelve years. The crisis ended Senegal's dual executive parliamentary system; a 1963 constitutional amendment abolished the office of prime minister and established a presidential regime under Senghor.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: President Leopold Sedar Senghor prevailed and consolidated presidential power; Prime Minister Mamadou Dia was arrested and imprisoned
RESEARCHED NAME
Key figures
Leopold Sedar Senghor (president of Senegal, target)
Mamadou Dia (prime minister, accused of attempting the coup)
Lamine Gueye (assembly president)

Sources

The December 1962 political crisis pitted President of the Council Mamadou Dia and four ministers against President Leopold Sedar Senghor, and it marked the end of the dual head parliamentary regime and the beginning of a presidential regime.
SOURCE REVIEWED Wikipedia (French), Crise politique de 1962 au Senegal open source ↗
On December 17, 1962 Dia directed police and gendarmerie to occupy the National Assembly and arrested four deputies to halt a no confidence motion, which the deputies then passed at the home of assembly president Lamine Gueye.
SOURCE REVIEWED Grokipedia, Mamadou Dia open source ↗
By 3 am on December 18 the coup had no chance of success, the gendarmerie and Dakar police placed themselves under the president's orders, and Mamadou Dia was arrested the next day and later sentenced to life imprisonment.
SOURCE REVIEWED WebGuinee, The Trial of Mamadou Dia open source ↗
After the coup was crushed in December 1962 the parliamentary system was abolished by constitutional amendment, establishing a presidential system with strengthened executive powers under Senghor.
SOURCE REVIEWED ConstitutionNet, Constitutional history of Senegal open source ↗

Editorial Note

Date match, well documented. Dataset codes it a palace coup, reflecting Dia's use of force against the legislature; whether it was a genuine coup attempt by Dia or a pretext used by Senghor remains debated by historians, which the summary reflects. First Senegal record in the dataset run.

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:

Cline Center id
43312171962
Albrecht/Koehler/Schutz (CAM) id
CAM-433-1962-12-17

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: President Leopold Sedar Senghor prevailed and consolidated presidential power; Prime Minister Mamadou Dia was arrested and imprisoned.

Baseline coding: Coup attempt failed to remove the incumbent. Recorded leader fate: remained in office; 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
⚑ This citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

CSP

Named in the baseline source document; no article citation was recorded.

Wikipedia

New York Times

“New Senegal Constitution Adds to Senghor’s Power,” February 7, 1963 Serbia and Montenegro

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 →

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