active 17th century Simon Du Cros

Simon Du Cros is identified in major library and public-domain catalog records as an active 17th-century writer and diplomat. His best-known surviving work, Letter from Monsieur de Cros, presents him as an ambassador at the Treaty of Nimeguen and a resident in England during the reign of Charles II.

That book is a forceful answer to Sir William Temple's memoirs, especially on events from 1672 to 1679. In it, Du Cros argues over questions of reputation, diplomacy, and who deserved credit or blame in delicate international negotiations, making his voice valuable for readers interested in firsthand political disputes from the period.

Very little biographical detail appears to be firmly documented in the sources I found beyond his public role and this publication, so his life remains somewhat obscure. Even so, his writing stands out for its directness and for the window it offers into the tensions of late 17th-century European statecraft.