Where does “*perθɨnɨd” come from?

*perθɨnɨd (Proto-Brythonic) comes from Latin pertineō, from Latin per, from Latin Ad, from Latin illic, from Latin ille, from Latin olle, from Proto-Italic *olnos — that.

Ancestry of “*perθɨnɨd”, step by step

StepLanguageWordMeaning
1Latinpertineōto extend, stretch out, reach, matter
2Latinperthrough, by means of; throughout, during
3LatinAdtoward, to
4Latinilliche, she, it, yonder, that, overthere; in that...
5Latinillethat; those; "; demonstrative pronoun "; that...
6LatinolleArchaic form of ille
7Proto-Italic*olnosthat

Words derived from “*perθɨnɨd

Every word from Proto-Italic *olnosEvery word from Latin olleEvery word from Latin ille