of many modern machines and an accurate approximation of pi. He is in modern times considered one of the best-known and one of the greatest of Hephaestus' children. It is the wish among many of Archimedes' modern-day siblings to find the lost works of Archimedes. During the Second Punic War, Archimedes was killed by a Roman guard working for General Marcus Claudius Marcellus who had given specific orders not to harm Archimedes. While searching for Nico with Frank Zhang and Hazel Levesque in Rome as seen in The Mark of Athena, Leo Valdez recovered the lost works of Archimedes. He uses them to destroy the eidolons, possessive spirits working for Gaea. He planned to take them to Bunker 9 at Camp Half-Blood to study them further. With Archimedes' works, Leo hoped to save Camp Half-Blood from the Roman forces from Camp Jupiter. Subsequently, Leo is seen to have adapted some of them for use on the Argo II in The Blood of Olympus as well as his own personal use. Banastre Tarleton – A demigod son of Bellona who participated in the Battle of Waxhaws. According to Reyna, Tarleton ignored the Colonial leader Abraham Buford's white flag and his forces massacred Buford's men. It is also mentioned that he was one of many Roman demigods who fought for the British during the American Revolution while the Greeks fought for the colonists. Blackbeard – The son of Ares, who was a notorious English pirate during the early 18th century. Instead of dying in his famous last stand, his ship landed on Circe's island where he and his crew were turned into guinea pigs for several hundred years. In The Sea of Monsters, Edward Teach is seen in guinea pig form. While on a quest, Annabeth Chase used Hermes' multivitamins to turn all of the guinea pigs back into humans. Along with his crew, he began to chase after Circe while Percy and Annabeth escaped with their pirate ship, the Queen Anne's Revenge. In The Son of Neptune, Reyna reveals that Blackbeard and his pirates took over the island and enslaved Reyna and her sister before they managed to escape. Franklin D. Roosevelt – The former President of the United States, who was mentioned by Bianca in The Titan's Curse when she was trying to name the previous president due to her long period of time in the Lotus Casino. Frédéric Bartholdi