Raymond of Aguilers 

He was a crusader who was at the Christian massacre of the Muslims and Jews when the Christians captured Jerusalem on 14 Jun 1099.  After the massacre he is said to have quoted Psalm 188 'This is the day the Lord has made.  Let us rejoice and be glad of it.' (See "The Hiram Key" page 23)

Is this another example of Christians being good Christians?  The killing of all those people must have been a good deed since it had been done in the mane of God.