Sentence:  The <WSD>de profundis</WSD> attracted the ire of protestant polemicists including James Pilkington, Bishop of Durham, not merely because the speaking of the <WSD>de profundis</WSD> (usually by some boy) was a traditional feature of Roman Catholic funerals, but more specifically because of its association with Catholic belief in purgatory. 
Meaning of the word marked with <WSD> tags:  (De Profundis) (psalm)