Lyncus
In Greek mythology, King Lyncus of the Scythians was taught the arts of agriculture by Triptolemus but he refused to teach it to his people and then tried to kill Triptolemus. Demeter turned him into a lynx as punishment.
The myth is not known from any extant Greek sources, but it is found in Ovid's Metamorphoses 5.648-661 :
