The prolific Jason McKittrick brings us this Iron Age Cthulhu idol.
"The idol is believed to depict the infamous Great Old One Cthulhu. If this belief is correct then the sacrificial victim may have been a member of an ancient Cthulhu cult dating back to the Iron Age. The depositing of the body with the idol into the bog may have been an attempt by superstitious cultists to appease Cthulhu for a perceived offense.
Analysis of the idol has yielded more questions than answers. A metallurgical study returned no matches of any known substance on earth however the item seems to possess attributes of both iron and copper and is completely resistant to rust or patina. Researchers have suggested the unknown alloy to be of possible celestial origins."