from
Easton's 1897 Bible Dictionary
Lamech
the strikerdown; the wild man. (1.) The fifth in descent from
Cain. He was the first to violate the primeval ordinance of
marriage (Gen. 4:18-24). His address to his two wives, Adah and
Zillah (4:23, 24), is the only extant example of antediluvian
poetry. It has been called "Lamech's sword-song." He was "rude
and ruffianly," fearing neither God nor man. With him the
curtain falls on the race of Cain. We know nothing of his
descendants.
(2.) The seventh in descent from Seth, being the only son of
Methuselah. Noah was the oldest of his several sons (Gen.
5:25-31; Luke 3:36).