The Concubine pictured the culture of marriage and forbidden traditions and was originally published in 1966.
It has remained a recommended text, which is widely read in schools across Africa.
Amadi's other books include Sunset in Biafra, Peppersoup, The Slave and The Road to Ibadan.
Political appointments
A physics and mathematics graduate of the University of Ibadan, Amadi joined the Nigerian army and continued serving in it during the civil war, despite coming from the Niger Delta, which was part of the breakaway state of Biafra.
When retired as a captain, he also worked as a teacher and held several political appointments in his native Rivers State.
