I recently listened to a second collection of similar chants sung by the Knights Templar. That one will be posted in a short while.
Also, I kept seeing the below phrase all over the YT comments, so I looked it up:
Deus vult (Latin for “God wills it”) was the cry of the people at the declaration of the First Crusade by Pope Urban II at the Council of Clermont in 1095 when the Eastern Orthodox Church requested help in defense from Islamic invasions beginning with the Muslim conquests. The phrase appears variously as Deus vult (Classical Latin), Dieu le veut (French), Deus lo vult, etc. – Babylon Dictionary
Title: Le chant des templiers Chants of The Knights Templar FULL (YT link) Uploaded by Copinzo.
Thanks to The Crusader for posting the tracklist.
0:00 – Da Pacem Domine.
7:57 – Te Deum Patrem.
23:12 – Benedicat Nos Deus.
29:54 – Media Vita In Morte Sumus.
41:31 – Honor Virtus et Potestas
47:49 – Kyrie Eleison
55:52 – Salve Regina
1:11:53 – Da Pacem Domine (2nd time)
1:22:15 – Honor Virtus et Potestas (2nd time)
1:28:37 – Crucem Sanctam Subiit
1:37:40 – Da Pacem Domine (3rd time)