highvalyrian1-1  Exercise 2: Origin and Descendants
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Who and from what
  David J. Peterson, chosen by HBO through a competition among language
  creators, built High Valyrian from the few fragments in George R. R.
  Martin's novels (valar morghulis, valar dohaeris, dracarys and a few
  more).

Bastard Valyrian
  The locally evolved dialects of the Nine Free Cities (for example
  Astapori and Meereenese Valyrian). They simplify the grammar of High
  Valyrian: Astapori lost the case system and reduced four genders to two.

The comparison
  Peterson compared High Valyrian to Classical Latin and the Bastard
  dialects to the Romance languages that grew from it.