The Jolof Empire was founded by a voluntary confederacy of States; it was not an empire built on military conquest in spite of what the word "empire" implies. The Serer tradition of Sine attests that the Kingdom of Sine never paid tribute to Ndiadiane Ndiaye nor to any member of his descendants that ruled Djolof. Historian Sylviane Diouf states that "Each vassal kingdom—Walo, Takrur, Kayor, Baol, Sine, Salum, Wuli, and Niani—recognized the hegemony of Jolof and paid tribute." It went on to state that, Ndiadiane Ndiaye himself received his name from the mouth of Maissa Wali (the King of Sine). In the epics of Ndiadiane and Maissa Wali, it is well acknowledged that Maissa Wali was pivotal in the founding of this Empire. It was he who nominated Ndiadiane Ndiaye and called for the other states to join this confederacy, which they did, and the "empire" headed by Ndiadiane, who took residence at Djolof. It is for this reason scholars propose that the empire was more like a voluntary confederacy than an empire built on military conquest.