R. M. Ballantyne 
Fugitives The Tyrant Queen of Madagascar [EPUB ebook] 

(Excerpt): "It is almost allowable, I think, to say that this is a true story, for fiction has only been introduced for the purpose of piecing together and making a symmetrical whole of a number of most interesting facts in regard to Madagascar and the terrible persecutions that took place there in the early part and middle of the present century. I have ventured to modify time and place somewhat, as well as to mix my characters and their deeds a little, in order to suit the conditions of my tale; but in doing so I have striven to avoid exaggeration and to produce a true picture of the state of affairs, at the period treated of, in what may be styled one of the most interesting and progressive islands of the world."