Where does “rule” come from?

rule (Middle English) comes from Old French reule, from Latin rēgula, from Latin -ula, from Proto-Indo-European -tlom, from Proto-Indo-European -trom, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

Ancestry of “rule”, step by step

rule traces back through two separate lines of ancestry.

via Old French reule

StepLanguageWordMeaning
1Old Frenchreulerule; ruler; rule
2Latinrēgularule, bar
3Latin-ularegō + API → rēgula; tegō + API → tēgula;...
4Proto-Indo-European-tlomAlternative form of *-trom
5Proto-Indo-European-tromForms nouns denoting a tool or instrument
6Proto-Indo-European-tḗrDerives agent nouns from verbs, denoting someone...

via Old French riule

StepLanguageWordMeaning
1Old Frenchriule
Every word from Proto-Indo-European -tḗrEvery word from Latin -ulaEvery word from Latin rēgula