The Jewels of the Order of St Patrick, commonly called the Irish Crown Jewels, were the heavily jewelled badge and star created in 1831 for the Grand Master of the Order of St Patrick, an order of knighthood established in 1783 by George III to be an Irish equivalent of the English Order of the Garter and the Scottish Order of the Thistle. The office of Grand Master was held by the Lord Lieutenant of Ireland.
The jewels were stolen from Dublin Castle in 1907, along with the collars of five knights of the order. The theft has never been solved, and the items have never been recovered.[1]