The other great "adventure" besides the <PERSON> journey was the boar hunt. The most famous was the Calydonian Boar Hunt. This one is a bit more difficult in the ancient details, since no epic exists of it. Nevertheless, it is attested as early as the Iliad.
First, all primary sources for it can be found on Theoi. I'll list the main ones.
* <PERSON>, Iliad 9.543ff.
* <PERSON>, Catalogue of Women, fr. 98
* <PERSON>, Bibliotecha, 1.66
* <PERSON>, Metamorphoses, 8.269
The point was to kill an oversized boar which was ravaging the land around Calydon. The king, <PERSON>, put a bounty out on it, and the most famous Greek heroes of the time (barring <PERSON>) joined in, including:
* <PERSON>, son of <PERSON>, and the subject
* <PERSON> and <PERSON>, twin sons of <PERSON> (though one was said to be born of his mortal father <PERSON>); these two were always adventuring about, and they also joined in the Argonaut quest (they're also the "Gemini" in the sky);
* <PERSON>, leader of the Argonauts as outlined by <PERSON>;
* <PERSON>, most famously known as the side-kick of <PERSON>;
* <PERSON>, father of <PERSON>, the greatest Greek warrior to fight in the Trojan War;
* <PERSON>, slayer of the <PERSON> and hero of Athens;
* <PERSON>, with whom <PERSON> fell in love; also known as the quickest woman in the ancient world, and the only woman ever mentioned in these adventures.
The prime hero of the story is <PERSON>, and this adventuring ultimately led to his demise.
(Ps.-Apollodorus, Bibliotecha 1.66, translated by <PERSON> with emendations by me)
When they had gathered, <PERSON> entertained them for nine days. On the tenth day, <PERSON> and <PERSON> and some of the others refused contemptuously to go out hunting with a woman [i.e. 351
<PERSON>], but <PERSON>...wanted to make a child with <PERSON>, and so compelled the men to join the hunt with her. When they had encircled the boar, the animal killed <PERSON> and <PERSON>, and <PERSON> accidentally speared <PERSON> [king of Phthia] with his javelin. <PERSON> was first to hit the boar, in the back with an arrow. <PERSON> then got it in the eye, and <PERSON> killed it with a blow on the flank. When he received the skin, he gave it to <PERSON>. But the sons of <PERSON>, who considered it disgraceful that a woman should get the trophy where men were involved, took the skin from her, saying that it was properly theirs by right of birth, if <PERSON> chose not to accept it. Outraged by this, <PERSON> slew them and again gave the skin to <PERSON>. But <PERSON>, in grief over the death of her brothers, set fire to the brand [that the Fates declared when consumed would end the life of <PERSON>, otherwise he would have lived forever], and <PERSON> died on the spot."
Another variant preserved by <PERSON>'s Metamorphoses is that <PERSON> instead killed his brothers <PERSON> and <PERSON>, who were the ones that took it from Atalanta. This makes better sense out of the "birthright" claim. 351