Zeus and the mountain nymph Taygete. He married Sparte, and named his capital city of Sparta after her, himself being the mythical ancestor of the Lacedaemonians.
His name strongly suggests 'lake demon', which although an English phrase derives from similar Greek words: lacos (or laccos), 'pond', 'lake' and daimon, 'god', 'demon'. This seems to point to some religious or magical ceremony, perhaps involving a sacrifice (to an underwater monster?).