if you manage to get all legendary endings you will get this line:
"In time, your summit would be come to be known as the most legendary since the first."
if you manage all good:
"In time, your summit would be come to be known as the most important since the first."
All peaceful endings (or all peaceful except a good rebel ending for revaire)
centered "In time, your summit would come to be known as be successful, even if the return of eventual tensions seemed likely."
if you get at least all peaceful endings but some better you get:
"In time, although your summit had mixed levels of success, it would be come to be known for the good it still achieved."
or
"In time, although some of your summit outcomes weren't as good as others, it would be come to be known for some of the incredible things that spawned out of it."
anything else means you got at least 1 bad or neutral end which causes what you saw.