Grand Commander of the Federal Republic
Reserved for the Head of State. By convention every elected President has been so honoured, as has Sir Abubakar Tafawa Balewa (posthumously, 2022).
Highest civilian honour
Chapter III · Power
The National Honours Act, No. 5 of 1964, established Nigeria's own honours system — two Orders, eight ranks. The Order of the Federal Republic and the Order of the Niger. Awarded by the President by warrant.
Reserved for the Head of State. By convention every elected President has been so honoured, as has Sir Abubakar Tafawa Balewa (posthumously, 2022).
Highest civilian honour
Reserved for the Vice-President. Senior Vice-Presidents and a small number of national figures have been honoured.
Second-highest
Senior cabinet, Chief Justices, principal Federal officers. Conferred on Ngozi Okonjo-Iweala, Aliko Dangote, and others.
3rd rank
Senior public service. Multiple Nobel laureates among the holders (Wole Soyinka, CFR).
4th rank
Mid-rank. Awarded broadly across the public sector, sports, and the arts.
5th rank
Mid-rank. Most-awarded honour by volume.
6th rank
Member-rank in the Order of the Federal Republic.
7th rank
Member-rank in the Order of the Niger. The most populous of the formal ranks.
8th rank
Conferred on Sir Kitoyi Ajasa (1929), Sir Adeyemo Alakija (1945) and other early Nigerian figures.
Colonial era
Sir Abubakar Tafawa Balewa appointed GCMG, 1960. Highest colonial-era honour held by a Nigerian.
Colonial era
Awarded the CFR (1986) and CON (later). Returned/rejected honours during the Abacha era as political protest.
Returned
Buhari conferred posthumous honours on Nigeria's founders: Balewa (GCFR), Awolowo (GCFR), Aminu Kano (CFR), MKO Abiola (GCFR, 2018), among others.
Buhari II
Tier 1 · primary
Courts. Gazettes. National archives.
Tier 2 · corroborating
OCCRP. HRW. BudgIT. TheCable.
Redline
Wikipedia is never a source.