According to the Royal Shell Port Sanibel Marina, History states that Henri Caesar, known as “Black Caesar,” turned to piracy in 1805, during the slave revolt in Haiti. After high-jacking a ship, Caesar and a squad of savaged slaves began raiding trade ships on the Spanish Main. After the war in 1812, British warships began patrolling the waters close to Cuba and the Bahamas. Caesar was forced to push his pirate pack north to the Gulf of Mexico. Some historians say Caesar has between two-and-six million dollars of treasure stashed on Pine Island.
Maybe he left clues while adventuring on Sanibel, or maybe just a small bit of treasure left behind.