The church he is kneeling in is the same church where Uther Lightbringer took his oath as first paladin. If you can deliver the Medallion of Faith to Aurius, he will aid you in combat against Baron Rivendare.
"Before I submit to this impending death, there is one last thing I must do."TCGWG 167
"It is good to see others who fight the Scourge in Stratholme, for it is here they are strongest. Greetings. I am Aurius. I was once a paladin of the Silver Hand, but like others whose faith wavered... I fell from grace. The Scourge seduced me and nearly transformed me into a death knight! Finally sensing my peril, I fled to this chapel. It is a sacred place where the first paladin, Uther the Lightbringer, was ordained into the Knights of the Silver Hand."
Aggro of Rivendare
Rivendare! I come for you!
Rivendare killed
Argh!
Outro
"Leave me. My wounds are great and I fear they will overtake me. Thank you, <name>. I will die here, but because of you... I'll die in peace."
Cataclysm
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In Cataclysm, the final boss in Stratholme is named Lord Aurius Rivendare. Judging by his first name, look and gear, he was most likely raised from the dead after he fell against Baron Rivendare.