- 15 January 1956 — Oloibiri-1 strikes oil in Ogbia Division; production begins 1958. Communities receive no equity, no royalties, and no environmental protection — the original sin of the Nigerian oil economy.
- 23 February – 7 March 1966 — Twelve-Day Revolution. Isaac Adaka Boro, Sam Owonaro and Nottingham Dick proclaim the Niger Delta Republic at Kaiama. Federal troops crush the rising; Boro is tried for treason and later pardoned. He becomes the patron saint of every later Ijaw militant.
Bayelsa State · Crisis deep dive
Late colonial · First Republic (1929–1966)
Methodology
Tier 1 · primary
Courts. Gazettes. National archives.
Tier 2 · corroborating
OCCRP. HRW. BudgIT. TheCable.
Tier 4 · tertiary, flagged
Wikipedia only where primary is pending. Always labelled.