Diomedes

Diomedes did show hubris because Athena gave him very specific order and he flagrantly dissobeyed her. "You must not fight the immortal powers head-on, all but one of the deathless gods, that is- if Aphrodite daughter of Zeus slips into battle, she's the one to stab with your sharp bronze spear." Diomedes followed the second part of Athena's instructions, he stabbed Aphrodite, but then he proceeded to attack Apollo, to no avail. Through Diomedes actions hubris is shows, as he disobeyed the gods and attacked Apollo.