The next sentence of the North Wind and the Sun starts with this word. illoren is a clause-level modifier that denotes that a period of time has finished and now something is going to happen. I generally translate it as “finally”.
illoren ñamma jacēha jatōrren ā mūrāna masīrien;
From Tuesday’s post we also know that it is the North Wind (mūrāna masīrien) that is about to do something.