*Everything about Treben has disappeared from the article. Why? The information was sourced, and vital since Arnswalde took over Treben's function as the central market for the region, which was also sourced. 

 No, what was/is in the article is that the construction of this "Treben" was discontinued. Hence, it's actually a fairly minor part of the story, basically a who cares. Are you sure you're not confusing yourself with your Trebens and Sovins here? If Treben was a significant part of the story then, I'm sorry, that just does not appear to be clear from your text. Rewrite it, and propose it on talk, in a way which clarifies the situation. This one might be just a simple failure of communication.