Usage of Middle English "fel it hap"

The OED entry for happen notes the following:

In Middle English fel it hap meant "it happened."

A search for the phrase reveals this OED entry and nothing else relevant. It is not clear how one would use this phrase in a conversational context. For example, could it be used in a sentence like the following?

Fel it hap that the man did dege.

i.e.:

It happened that the man died.

Or, was it used as an exclamation?

The man did dege! Fel it hap!

*All "Middle-English-y" example sentences here are of my own making, and I know nothing about Middle English.

How was this phrase used? Can you provide any notable examples from medieval works?

Thanks in advance!