Travis,
Thanks for the note. More to the point, why Ylaruam? It is one of those words that doesn't seem to have much meaning - Karameikos and Daroken sound like nations or cities, but Ylaruam feels like an anagram of something else.
Lawrence left TSR right before I got there, so I've only had the chance to chat with him in later years, and to the best of my knowledge his original material was not passed on to the people writing the Gazetters. Zeb probably knew something about it because of X1/Isle of Dread, but it is an example of things getting dropped away. By the time I did the Mystara set, I was uses the Gazzes as my source material.
Jeff