besides the pelopid line, and whatever remained of the atlantid stemmata among which it ultimately belongs, little is known for certain about the further content of book 4. it is possible that an athenian section including the various autochthonous kings of athens and the daughters of cecrops was found here. a family springing from the river asopus has also been proposed for this region based on the presence of "several persons or families that other sources represent as descended from daughters of asopos." the most notable family that would belong to this section is that of asopus' daughter aegina, the nymph of the island that bears her name who slept with zeus and bore aeacus. fearing that aeacus would be lonely on his island, zeus changed all of aegina's ants into men, spawning the tribe of myrmidons, a play upon their name and the greek word for "ant", , "mýrmēx". this is the family to which achilles belongs, the most notable hero in the trojan saga, as well as his father peleus and uncles telamon and menoetius.