Anemoi four Anemoi and several minor wind gods are involved in the defense of Mount Olympus against Kronos (the Titan Cronus), the first series's chief antagonist. Both the Greek and the Roman forms of the Anemoi appear in Riordan's second series. Boreas is a central character in "The Lost Hero", and his children Khione, Calais, and Zetes continue to have important roles throughout the series. He resides in Montreal, and is described as "sturdily built...with dark purple wings" when in his Greek form, and as "taller and thinner" when Roman. "Notus/Auster appears in "The House of Hades" as a counselor of
Modern understanding of Greek mythology the Physical theory the elements of air, fire, and water were originally the objects of religious adoration, and the principal deities were personifications of the powers of nature. The sciences of archaeology and linguistics have been applied to the origins of Greek mythology with some interesting results. Historical linguistics indicates that particular aspects of the Greek pantheon were inherited from Indo-European society (or perhaps both cultures borrowed from another earlier source), as were the roots of the Greek language. Prominent Sanskritist Max Müller attempted to understand an Indo-European religious form by tracing it back to its Aryan, Vedic, "original" manifestation.