Where does “*-sehen” come from?

*-sehen (Finnish) comes from Proto-Finnic -hen, from Proto-Finnic -sen — Illative case ending.

Ancestry of “*-sehen”, step by step

StepLanguageWordMeaning
1Proto-Finnic-hen—
2Proto-Finnic-senIllative case ending
Every word from Proto-Finnic -sen →Every word from Proto-Finnic -hen →