The Origin of the Solas

With Reformation Day rapidly approaching it seems appropriate to consider the origins of what we call the solas of the reformation (i.e. Sola Scriptura, Sola Gratia, Sola Fidei, Solus Christus, and Soli Deo Gloria). Scott Clark has a helpful post outlining the history of these five tennets of the Protestant Reformation. You can read it here. If anyone is able to contribute more to the historical development of Solus Christus and Soli Deo Gloria, feel free to do so in the comment section of this post.