Treaty of Fontainebleau' (October 27, 1807). Signed on 27 October 1807 between Manuel Godoy and Napoleon Bonaparte. The joint Franco-Spanish military invasion of Portugal, an ally of Great Britain, was agreed, allowing French troops to pass through Spanish territory. Engraving. Historia del Levantamiento, guerra y revolucion de Espana by the Conde de Toreno. Madrid, 1851. (Photo by: Prisma/Universal Images Group via Getty Images)