Cryptogram of Olivier Levasseur

The cryptogram of Olivier Levasseur (also known as La Buse cryptogram) is a 17-line pigpen cipher allegedly created by 18th-century French pirate Olivier Levasseur, and first attested by French historian and librarian Charles de La Roncière in his 1934 paperback novel Le Flibustier Mystérieux: Histoire d'un trésor caché. La Roncière claimed the cryptogram and the treasure to which it purportedly refers originated from a raid on the Portuguese cargo ship Nossa Senhora do Cabo in 1721 by a group of pirates including Levasseur, Jasper Seagar and Captain John Taylor.

Source: Wikipedia — Cryptogram of Olivier Levasseur (CC BY-SA 4.0)