Jan Vansina's history of the Nyiginya kingdom joins the long list of works, both essays and novels, that have proliferated since the Rwanda Patriotic Front gained power in 1994. The rigorous application of historical criticism distinguishes this from other works that give voice primarily to passions and speculations. Vansina's work is remarkable for the author's ability to bridge past and present by placing himself downstream rather than upstream in the flow of history. This important emphasis on ancient Rwanda contributes to the understanding of today's events. Vansina was ahead of those whose project it was to reread the history of Rwanda, which began in Butare in December 1998. Nonetheless, he emphasizes that it is up to Rwandan historians themselves to compile, on the basis of the facts accepted by everyone, a history that is as impartial as possible and that might offer some guidelines for the future.

In 1962, when Vansina was writing L'évolution du royaume rwanda des origines à 1900 (The Evolution of the Rwandan Kingdom from Its Origins to 1900), his work was already marked by a rigorous exploration of historical facts. In Le Rwanda ancien (Ancient Rwanda), he proposes a new chronology of the Nyiginya kingdom, whose foundation he places around the middle of the seventeenth century. In so doing, Vansina definitively separates himself from Alexis Kagame—who situates its beginnings six centuries earlier—and thereby puts to rest the argument of historians and anthropologists, and challenges those politicians who, in the pursuit of legitimacy, have based their ideologies of the Rwandan reconquest and territorial revindication on the writings of Kagame.