On Mon, 26 Feb 2018 15:25:48 +0000
Raymond Brown <[log in to unmask]> wrote:

> Yet Frankish _þwalja_ became _toaille_ in Old French with initial [t].
> Why?  Had continental Germanic already begun th-stopping as early as
> the 5th/6th centuries AD?


The Norse runes are a reduced set, using the same characters for voiced
and voiceless stops, and the one rune for /u ü o ɔ ö w/, but they kept
the rune thorn for /θ/. It still occured in 13th century Sweden.

Spelling changes show the loss of /θ/ in Germany. High German had lost
it by about 900, Low German gradually between the 11th and 14th