Grimm's law
Similar efforts to extrapolate Romance languages are "Breathanach" (influenced by the other branch of Celtic), "Judajca" (influenced by Hebrew), "Þrjótrunn" (a non-Ill Bethisad language influenced by Icelandic), "Wenedyk" (influenced by Polish), and "Xliponian" (which experienced a Grimm's law-like sound shift). It has also inspired "Wessisc", a hypothetical Germanic language influenced by contact with Old Celtic.