Speak to Kerah about the fancy carvings and stonework. She recommends to visit Calcelmo for the history lessons of Markarth and asks the Dragonborn to deliver a Calcelmo's Ring to Calcelmo because she does not have time to do it on her own.
Go to Understone Keep and meet Calcelmo, give him the ring. In return, he offers leveled as a reward.
|Delivery to Calcelmo – FreeformMarkarthD|