Where does “encensier” come from?

encensier (Old French) comes from Old French encens, from Latin incēnsum, from Latin incensus, from Latin incendō, from Latin īn-, from Latin în, from Latin en, from Proto-Italic en — in.

Ancestry of “encensier”, step by step

Step	Language	Word	Meaning
1	Old French	encens	incense
2	Latin	incēnsum	—
3	Latin	incensus	set on fire; burnt; excited
4	Latin	incendō	to set on fire, burn, kindle
5	Latin	īn-	un-, non-, not
6	Latin	în	in, at, on, upon, from (space)
7	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
8	Proto-Italic	en	in
9	Proto-Indo-European	h₁én	in

Words derived from “encensier”

censer
censier
censer

Every word from Proto-Indo-European h₁én →Every word from Latin īn- →Every word from Proto-Italic en →