Image permission and credit: The Metropolitan Museum of Art
The saints depicted are (from left to right) Anthony Abbot, John the Baptist, Julian the Hospitaller, and Francis of Assisi.
"So that now I care most for Michael Angelo, Luca Signorelli, Mantegna, Giotto, Botticelli, Andrea del Sarto. Paulo Uccello, and Piero della Francesca" and he admired "Botticelli everywhere" Memorials Vol p 26
These quotations were taken from a sketchbook filled with drawing s and observations during his 1871 trip to Italy and which is now held in the Museum of New Zealand, Wellington.