Find Queen Freydis's Sword for Oengul War-Anvil

Walkthrough
Talking to blacksmith Oengul War-Anvil in Windhelm will bring up the topic of a very special sword, Queen Freydis's Sword. Oengul would like the Dragonborn to retrieve it for him.

Find Queen Freydis's Sword inside 
The sword is located inside one of the following randomly selected locations:

Return Queen Freydis's Sword to Oengul War-Anvil
Return the sword to the blacksmith, for a boost in smithing. Finde Königin Freydis' Schwert für Oengul Kriegs-Amboss