We have not yet exhausted the catalogue of beings generated during this early period, anterior to the birth of Zeus. Nyx, alone and without any partner, gave birth to a numerous progeny: Thanatos, Hypnos and Oneiros; Mômus and Oïzys (Grief); Klôthô, Lachesis and Atropos, the three Fates; the retributive and equalizing Nemesis; Apatê and Philotês (Deceit and amorous Propensity), Gêras (Old Age) and Eris (Contention). From Eris proceeded an abundant offspring, all mischievous and maleficent: Ponos (Suffering), Lêthê, Limos (Famine), Phonos and Machê (Slaughter and Battle), Dysnomia and Atê (Lawlessness and reckless Impulse), and Horkos, the ever watchful sanctioner of oaths, as well as the inexorable punisher of voluntary perjury.[11] [11] Hesiod, Theog. 212-232. Gæa, too, intermarrying with Pontus, gave birth to Nereus, the just and righteous old man of the sea; to Thaumas, Phorkys and Kêtô. From Nereus, and Doris daughter of Oceanus, proceeded the fifty Nereids or Sea-nymphs. Thaumus also married Elektra daughter of Oceanus, and had by her Iris and the two Harpies, Allô and Okypetê,—winged and swift as the winds. From Phorkys and Kêtô sprung the Dragon of the Hesperides, and the monstrous Grææ and Gorgons: the blood of Medusa, one of the Gorgons, when killed by Perseus, produced Chrysaor and the horse Pegasus: Chrysaor and Kallirrhoê gave birth to Geryôn as well as to Echidna,—a creature half-nymph and half-serpent, unlike both to gods and to men. Other monsters arose from the union of Echidna with Typhaôn,—Orthros, the two-headed dog of Geryôn; Cerberus, the dog of Hadês, with fifty heads, and the Lernæan Hydra. From the latter proceeded the Chimæra, the Sphinx of Thêbes, and the Nemean lion.[12] [12] Hesiod, Theog. 240-320. Apollodôr. i. 2, 6, 7. A powerful and important progeny, also, was that of Styx, daughter of Oceanus, by Pallas; she had Zêlos and Nikê (Imperiousness and Victory), and Kratos and Bia (Strength and Force). The hearty and early coöperation of Styx and her four sons with Zeus was one of the main causes which enabled him to achieve his victory over the Titans. Zeus had grown up not less distinguished for mental capacity than for bodily force. He and his brothers now determined to wrest the power from the hands of Kronos and the Titans, and a long and desperate struggle commenced, in which all the gods and all the goddesses took part. Zeus convoked them to Olympus, and promised to all who would aid him against Kronos, that their functions and privileges should remain undisturbed. The first who responded to the call, came with her four sons, and embraced his cause, was Styx. Zeus took them all four as his constant attendants, and conferred upon Styx the majestic distinction of being the Horkos, or oath-sanctioner of the Gods,—what Horkos was to men, Styx was to the Gods.[13] [13] Hesiod, Theog. 385-403.