James Branch Cabell (1879-1958)
Figures of Earth: A Comedy of Appearances (1921)
Illustrated by Frank C. Papé (1878-1972)
About the life of Manuel the swineherd, who is subsequently remembered in legend as Dom Manuel the Redeemer.
There’s a Wikipedia article here:
From Project Gutenberg. The file is on the US server because of the illustrations. Their US copyright was not renewed.