Allan Quatermain
Set primarily in Africa, 1835 to 1885 The series is numbered here according to Allan Quatermain's life story, or the fictional chronology. It comprises all Quatermain stories, some of which also belong in the Ayesha/She series or Zulu Nation/Umslopogaas series, but Ayesha and Zulu Nation at ISFDB contain only stories in which Quatermain does not appear.
The Chronology table at Wikipedia covers all three series, listed by default according to the fictional chronology, c. 2000 BCE to 1899. Notes account for the appearances of Quatermain, Ayesha, and the Zulu Umslopogaas in those stories.
Published 1885 to 1927, beginning with King Solomon's Mines, set in 1880 near the end of Quatermain's life. The Wikipedia lists are or can be sorted by publication date.