Little is known of the Olympian Clan. What can be assumed, however, is that they lived on the slopes of Mount Olympus in Greece long ago. It is not known what relationships they may have had with the local humans or the Olympians.
When New Olympus was founded, the Olympians invited gargoyles from this and other Mediterranean gargoyle clans to join them on the island. Some of the gargoyles from this clan did indeed go on to become part of the New Olympian Clan and their descendents live on today.
Their mother clan did not survive. At some point in the past, probably long ago and at the hands of humans, the Olympian Clan was destroyed.