Poseidon, Cabin Three: Children of Poseidon are rare since the pact of the Big Three. The Sea God's most famous child in ancient times was Theseus, who was knows for his cleverness and fighting skill. In modern times his most famous child is Percy Jackson, who can breath underwater and sometimes even control water. Poseidon is also father of much lesser Cyclopes, such as Tyson, those Cyclopes are not considered Demigods and normally do not attend camp.