The first major sound change law discovered. It described the shift of stops which
the change from Proto-Indo-European to Proto-Germanic. It was first postulated by Friedrich von Schegel in 1806, then by Rasmus Christian Rask in 1818, and finally enunciated in its most famous form by Jakob Grimm
in 1822. It is composed
of three parts:
1. The shift of voiceless
stops to voiceless
fricatives, thus p > f, t > th, and k > x.
2. The shift of voiced stops to voiceless
stops, thus b > p, d > t, and g > k.
3. The deaspiration of the aspirated
stops, thus bh > b, dh > d, and gh > g.
Some exceptions to Grimm
's Law exist, most notably
by Karl Verner