Short answers, pulled from the story.
Lopo Homem received an official title granting him exclusive authority over nautical instruments. This appointment allowed him to construct and correct compasses for any ship sailing under Portugal's flag.
King Manuel I of Portugal commissioned the massive atlas that Lopo Homem completed in 1519. The document was intended as a diplomatic gift for Francis I of France.
The world map from 1519 displays a landmass stretching from the southern Atlantic to the southern Indian Oceans. It connects Brazil directly to the Malacca Peninsula, enclosing both the Oceanus Meridionalis and Indicum Mare.
Lopo Homem served as an expert witness for the Portuguese crown during these negotiations to settle territorial disputes between Portugal and Castile over the Molucca Islands. He presented evidence regarding exploration rights and maritime boundaries to support Portugal's claims.
The Museo Galileo in Florence now houses this specific artifact. This later work holds historical significance as the first to show Argentina.