Laocoön

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun mythology A Trojan priest of Poseidon (or Apollo, depending on the author), whose rules he had defied (or whom he had otherwise offended), who tried to warn his fellow citizens against the Trojan horse. He was killed for this, along with his two sons, by giant snakes sent by Minerva (or Poseidon, or Apollo).
• proper noun mythology An Argonaut, son of Porthaon.