Could the Eisbock freezing process be applied to other styles besides Bocks?

That's the spirit!

 

After reading about eisbocks and their association with the Kulmbacher brewery in the 1890s I recalled having read that story about frozen beer in a Swedish book on beer history and so went back and looked it up and sure enough. Of course they only claim that it was the first eisbock which was made, which leaves room for older examples of frozen beer. On that note however, another interesting factoid is that in november of 1539 Swedish king Gustav Vasa writes to one of his bailiffs in the south of Sweden telling him to acquire and send a barrel of embst (Einbeck) beer as soon as the ground is passable and to make sure that it arrives unfrozen. Beer from Einbeck was imported to Sweden from time to time, so I suppose it's not that far fetched to think that such beer might have become frozen at some point, somewhere, on its way north, and the contents consumed.