Cronus, otherwise known as "Cronus of the White Mountain," is seen as the father of the gods, in the beliefs of the humans of Teurang. His story dates back before the Triad War, when the swords of creation and destruction were forged. The deity himself is said to have imbued the swords wiith their immeasurable power.
At around the same moment in history, he introduced the Cronus Libra to the mage's capitol of Welim City. By helping them focus their use of Soulfire magic, they could train to become Wizards and focus their abilities. This enabled the Wizards to have the knowledge and perspective to influence their own DNA, giving way to the Great Evolution.
Soon after, Cronus disappeared along with the other gods, including his daughter, Lorelei.
According to Z's account in the first Journal, only a relative of Cronus can weild the swords, which means that there is some connection between them...