The Ibibio-speaking peoples of the lower Cross River - Ibibio proper, Annang, Eket, Oron, Ibeno - organised in village groups under elders, age grades and the Ekpe society rather than kings. Gale records no migration tradition for them at all: they look like the oldest continuous occupants of their own ground in southeastern Nigeria.
Not an ending: British punitive expeditions through the second half of the 19th century culminated in permanent military posts at Ikot Ekpene, Itu and Uyo in 1903, and the ground passes to Colonial Nigeria at 1900. The Ibibio Union would later petition the British for recognition as a sovereign nation; Akwa Ibom State is their homeland today.
The Ethnographic Survey volume that fixed the Ibibio/Annang/Efik sub-group map - the standard extent authority.
The colonial-era ethnography of the Ibibio by the district commissioner who surveyed the Cross River; full text open on the Internet Archive.