The author of this classic work is not to be confused with Samuel Johnson (1709-84), the English essayist, poet, and lexicographer usually known as "Dr Johnson". This Samuel Johnson (1846-1901) was an Anglican vicar of African descent. He was born in Freetown, Sierra Leone, but spent his adult life in Nigeria. His peace-efforts in the 1870s contributed to the eventual end of the Yoruba wars in 1886.
In 1880 Samuel Johnson became a deacon and was ordained a vicar in 1888. Claiming Yoruba ancestry, he was concerned that his people were losing their own history and completed the original manuscript of his history of the Yoruba people from his notes in 1897. Whether by accident or design, this completed manuscript was sadly lost. However, after his death, his brother, Dr Obadiah Johnson, produced this work from his notes. It was at last published in 1921. Unfortunately, Obadiah died in 1920 so neither he nor Samuel saw the finished product.
It remains a key resource for the understanding of Yoruba history.