A "very rare" ancient gold coin found recently in the mountains of central Norway could be lost cash that once belonged to an early monarch, according to Norwegian officials. The gold coin was discovered by a metal detectorist in Vestre Slidre, a rural city known for skiing, in Norway's south-central Innlandet County. Technically called "histamenon nomisma," the coin was first introduced around 960 C.E. and used as standard Byzantine currency, the Innlandet County Municipality said in a news release. That means the artifact would have traveled more than 1,600 miles from its origin site to the spot where it was...