Names are often repeated in dynasties, and the genealogies show that a distant ancestor of Thror was referred to, Thrain I, a fugitive from Moria, who first discovered the Lonely Mountain, Erebor, and ruled there for a while, before his people moved on to the remoter mountains of the North.
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The world wide web is making genealogy easier than ever.
The researcher is utilizing a database that combines genealogy records with vital statistics including cause-of-death.