Where does “scrien” come from?

scrien (Middle English) comes from Middle English ascrien, from Old French escrier, from Old French es, from Old French en, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

Ancestry of “scrien”, step by step

Step	Language	Word	Meaning
1	Middle English	ascrien	—
2	Old French	escrier	to cry out; to shout out loud
3	Old French	es	in the
4	Old French	en	in; inside; on; upon; in
5	Latin	în	in, at, on, upon, from (space)
6	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
7	Proto-Italic	en	in
8	Proto-Indo-European	h₁én	in

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