The Fort Caroline National Memorial at Jacksonville, Florida, has been for several years assembling for ultimate display at its museum various objects illustrative of the methods of navigation used by the explorers and settlers of the 16th century. I have been assisting in this search, and as a by product of it we recently discovered and purchased by private donations the only known signature of Rene Laudonniere, the French Governor of Fort Caroline. Under this man’s leadership the permanent settlement of what is now the United States was begun. A map dealer in England (Maggs Brothers) told us about the manuscript and sold it to us.
Bennett, Charles E.
"A 16th Century French Manuscript Bearing the Only Known Signature of Rene Laudonniere,"
Florida Historical Quarterly: Vol. 39
, Article 5.
Available at: https://stars.library.ucf.edu/fhq/vol39/iss3/5