Catholic Gregorian Chant - Haec Dies, Confitemini Domino.

This video does not attempt to explain the vast subject of the Crusades, it is merely a short visual representation of some notable events and characters. For example; Peter the hermit, the Crusade leaders, St. Bernard of Clairvaux preaching the crusade, the capture of Jerusalem, etc. The two hymns in the background are Haec Dies and Confitemini Domino. The respective lyrics and translations of these hymns follow:

Haec dies quam fecit Dominus:
exultemus et laetemur in ea.
Alleluia.

This is the day that the Lord made:
let us be glad and rejoice in it.
Alleluia.

Confitemini Domino, quoniam bonus, quoniam in saeculum misericordia eius. Alleluia.

Have faith in the Lord for He is good, for His mercy is forever; alleluia, alleluia!

source: www.youtube.com/watch