Apollodorus 2.5.11
Typhon and Echidna, parents of the dragon
that guarded the Apples of the Hesperides;
and the parents of the eagle that regularly devoured Prometheus' liver.
Apollonius of Rhodes, Argonautica 4.1396
Ladon was the name of the dragon which guarded the golden apples of the Hesperides.
Hesiod, Theogony 333-334
The giant snake that guards the Apples of Gold is the child of Ceto by Phorcys;
19 Dec 2004