E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A horn long in the possession of the reigning princes of the House of Oldenburg, but now in the collection of the King of Denmark. According to tradition, Count Otto of Oldenburg, in 967, was offered drink in this silver-gift horn by a wild woman, at the Osenborg. As he did not like the look of the liquor, he threw it away, and rode off with the horn.