Board Thread:General Discussion/@comment-24402683-20131012015855/@comment-3076045-20140205115719

Someone said it above... the An-Xileel actually got involved during the Oblivion Crisis, and were fighting the Daedra. The Thalmor, from what we know, stayed in their Crystal Tower, and put on a big show, and claimed responsibility for the gates being closed in Summerset Isles, after Martin closed the gates using the Amulet of Kings. (Incidentally... the Amulet of Kings plays a part in the main storyline in ESO).