David Reubeni
David Reubeni (Hebrew: דוד הראובני, romanized: Dāvid ha‑Reʾūvenī;1490–1535/1541? ) a was a Jewish "half-mystic, half-adventurer." Reubeni presented military and political plans to various Christian rulers in Europe. His proposals, which combined political-military strategies with eschatological elements, along with his origin and enigmatic personality, remain partially understood.