This article examines the series, Corrispondenza degli ambasciatori fiorentini da Napoli, which is part of Fonti per la Storia di Napoli aragonese and saw its eighth, final volume published in 2015. It features a detailed discussion of this work, as well as observations on the features and research potential of the diplomatic source, and on the institutions and policies in the Kingdom of Naples during the 1484-1494 decade.