Princess of Crete
Infinity, the Guardian Chronicles, deel 1
Ariadne is the daughter of king Minos of Crete. Born roughly two thousand years before our calendar started she had to stand by and watch how her father's castle and a large portion of the island were leveled by Eternity. Saved from the flames by Gabriel, she was trained to be a Guardian and since then she has helped Gabriel by tending to the duties that are expected from a Guardian.
Ariadne finds out however that Eternity, the enemy she has sworn bloody vengeance on, is in fact a creation of the man who saved her life. This brings her to leave the Guardians in 'Eternity' after which she walks an (as yet unknown) own path.