My friend,
Yet another unresolved mystery, and for you, an opportunity to further enrich your collection of artefacts and your wealth - which must exceed mine in view of your many successes!
It turns out that a Florentine sailor left me four parchments at a fair price.
This deals with astronomy, ethnology, cartography ... basically everything that exceeds his skills, as well as mine.
They were written by a partner of Vespucci, a scientist, who participated in one of his expeditions. He would have returned years later to a small village to end his life, with his treasures. Find this place. Keep what you want.
Ben Gunn