These details were not generally known until the publication of Haggard's 1981 biography by Sydney Higgins.
He was appointed a Knight Bachelor in 1912 and a Knight Commander of the Order of the British Empire in the 1919 New Year Honours.
Haggard lived at 69 Gunterstone Road in Hammersmith, London, from mid-1885 to circa April 1888.
It was at this Hammersmith address that he completed King Solomon's Mines (published September 1885).
They had a son named Jack (who died of measles at age 10) and three daughters, Angela, Dorothy and Lilias.
Lilias Rider Haggard became an author, edited The Rabbit Skin Cap and I Walked By Night, and wrote a biography of her father entitled The Cloak That I Left (published in 1951).
Moving back to England in 1882, the couple settled in Ditchingham, Norfolk, Louisa's ancestral home.
Later they lived in Kessingland and had connections with the church in Bungay, Suffolk.
Haggard also wrote about agricultural and social reform, in part inspired by his experiences in Africa, but also based on what he saw in Europe.
At the end of his life, he was a staunch opponent of Bolshevism, a position that he shared with his friend Rudyard Kipling.
Africans often play heroic roles in the novels, although the protagonists are typically European (though not invariably).