Where does “'cause” come from?

'cause (English) comes from Middle English cause, from Old French cause, from Latin causa, from Old Latin caussa, from Proto-Indo-European kawd-teh₂.

Ancestry of “'cause”, step by step

Step	Language	Word	Meaning
1	Middle English	cause	cause
2	Old French	cause	cause
3	Latin	causa	cause, reason; case, claim, contention; motive,...
4	Old Latin	caussa	cause, reason, purpose; case, claim; Archaic form...
5	Proto-Indo-European	kawd-teh₂	—