The son of Hyllus—Kleodæus—as well as his grandson Aristomachus, were now dead, and the lineage of Hêraklês was represented by the three sons of the latter,—Têmenus, Kresphontês, and Aristodêmus, and under their conduct the Dorians penetrated into the peninsula. The mythical account traced back this intimate union between the Herakleids and the Dorians to a prior war, in which Hêraklês himself had rendered inestimable aid to the Dorian king Ægimius, when the latter was hard pressed in a contest with the Lapithæ. Hêraklês defeated the Lapithæ, and slew their king Korônus; in return for which Ægimius assigned to his deliverer one third part of his whole territory, and adopted Hyllus as his son. Hêraklês desired that the territory thus made over might be held in reserve until a time should come when his descendants might stand in need of it; and that time did come, after the death of Hyllus, (see Chap. V.) Some of the Herakleids then found shelter at Trikorythus in Attica, but the remainder, turning their steps towards Ægimius, solicited from him the allotment of land which had been promised to their valiant progenitor. Ægimius received them according to his engagement, and assigned to them the stipulated third portion of his territory:[2] and from this moment the Herakleids and Dorians became intimately united together into one social communion. Pamphylus and Dymas, sons of Ægimius, accompanied Têmenus and his two brothers in their invasion of Peloponnêsus. [2] Diodôr. iv. 37-60; Apollodôr. ii. 7, 7; Ephorus ap. Steph. Byz. Δυμᾶν, Fragm. 10, ed. Marx. The Doric institutions are called by Pindar τεθμοὶ Αἰγιμίου Δωρικοί (Pyth. i. 124). There existed an ancient epic poem, now lost, but cited on some few occasions by authors still preserved, under the title Αἰγίμιος; the authorship being sometimes ascribed to Hesiod, sometimes to Kerkops (Athenæ. xi. p. 503). The few fragments which remain do not enable us to make out the scheme of it, inasmuch as they embrace different mythical incidents lying very wide of each other,—Iô, the Argonauts, Pêleus, and Thetis, etc. But the name which it bears seems to imply that the war of Ægimius against the Lapithæ, and the aid given to him by Hêraklês, was one of its chief topics. Both O. Müller (History of the Dorians, vol. i. b. 1, c. 8) and Welcker (Der Epische Kyklus, p. 263) appear to me to go beyond the very scanty evidence which we possess, in their determination of this last poem; compare Marktscheffel, Præfat. Hesiod. Fragm. cap. 5, p. 159. Such is the mythical incident which professes to explain the origin of those three tribes into which all the Dorian communities were usually divided,—the Hyllêis, the Pamphyli, and the Dymanes,—the first of the three including certain particular families, such as that of the kings of Sparta, who bore the special name of Herakleids. Hyllus, Pamphylus, and Dymas are the eponymous heroes of the three Dorian tribes.