Board Thread:Skyrim/@comment-12911113-20130721155207/@comment-24400038-20140402163811

I'm pretty sure the Greybeards summoned me right as I was getting the first letter from a friend.

The booming noise you heard was, in fact, the Greybeards summoning you. "Dovahkiin"  This is, of course, all most of them will say to you.