Did Satan ever see the glory of God?

Known: The seraphim, possibly among the most powerful of created beings, cover their face in the presence of God: > Isaiah 6:2 Above it stood the seraphim: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. For Christians, one of the highest (if not the highest) privilege of heaven is seeing the glory of God. > http://www.desiringgod.org/resource-library/books/god-is-the-gospel--2 Question: Satan -- before his fall -- did he observe the glory of God?