Cosma e Damiano from Pisa, and it was Guido, not Nicholas, who was his early protector at the papal court. Geisthardt has established that Boso was born probably at Loppia near Lucca in Tuscany. His conclusions are now accepted in academic literature.
Guido provided support to someone at the papal court, and it was not Nicholas. Similarly, Geisthardt's findings about Boso's birthplace have been accepted by academic circles.