On June 12, 1993, the Presidential elections were held in Nigeria, which was the first since the 1983 military coup.
The election involved two parties, the Social Democratic Party (SDP) and the National Republican Convention (NRC), with the SDP candidate Moshood Abiola defeating the NRC candidate Bashir Tofa.
The elections were later annulled by the then Head of State and Military Ruler Ibrahim Babangida, which led to a crisis that ended with Sani Abacha leading a coup later in the year.
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https://www.afoinfoblog.com/2018/06/10-facts-you-need-to-know-about-june-12.html