Manuel da Silva Rosa (born 1961)^[1] is a Portuguese American writer and independent researcher and lecturer on the life of Christopher Columbus. Rosa received a PhD in Insular and Atlantic History (XV-XX Centuries) from Azores University (April 12, 2023) with a dissertation titled CRISTOFORO COLOMBO versus CRISTÓBAL COLÓN Cristoforo  Colombo, the weaver from Genoa, was not Don Crsitóbal Colón, the navigator from Ibéria^[2] and has published several controversial books and has been featured in Polish documentaries about Columbus and several other international media outlets.^{[citation needed]}

In his latest book, Portugal na História, Uma Identidade (Lisbon, 2023) Professor João Paulo Oliveira e Costa describes Rosa's work as scrupulous, "No estudo recente de Manuel Rosa, que, respeitando escrupulosamente as fontes, deixa clara a impossibilidade de Colón ter nascido no seio de uma família de tecelões genoveses.”.^[3]