Now i have scoured the internet for the answer to this and the two answers given dont solve my problem. now i spoke to the Jarl at Markarth and am looking for the shield of Hrolfdir . i went to the blind cliff cave and let the sister out of the cage and killed Petra. well in the one chest it wasnt there. also checked secret rooms. another solution was Hag's end, well i killed everything there and there was no chest next to the dragon shout wall. i would like to complete this quest so i can buy a house in Markarth. thx so much for the help

no ideas? nothing?