Really Difficult.. What is this song?

It can well be "Now We Are Free" from the movie "Gladiator", composed by Hans Zimmer and performed by Lisa Gerrard. Far too many web sources list it as a song by Enya but in fact it has got nothing to do with her. It may also well be a song "Adiemus" by Adiemus (composer-conductor Karl Jenkins and singers Miriam Stockley & Mary Carewe as multi-tracked).