as Guinness and Ryanair. It appears on the arms of countries with historical links to Ireland or the United Kingdom, such as Montserrat and Canada. In 1984, exemplars of the modern design, approved by the Chief Herald, were registered by the Government of Ireland with the World Intellectual Property Organization under Article 6ter of the Paris Convention, which relates to state emblems. The government only registered "left-facing" images, with the harp's sound board on the right. While the Attorney General's office felt that right-facing images should also be registered, patent agents advised this might be interfere with Guinness Brewery's use of such harps in its logo since the 1870s. Presidential Standard As well as being the arms of Ireland, since 1945 the harp is the arms of each President of Ireland whilst in office. Typically the arms are borne as a banner in the form of a Presidential Standard. The standard is flown over Áras an Uachtaráin, the President's residence in Dublin, at Dublin Castle when the President is in residence and on vehicles used by the President. As with other Presidential and Royal Standards, it is never flown at half mast. However, the Presidential Standard never takes precedence over the flag of Ireland, whereas, for example, the Royal Standard of the United Kingdom takes precedence over the flag of the United Kingdom. Previous arms The Lordship of Ireland, the medieval realm of Ireland that existed between 1171 and 1541 under the English crown, had separate arms. A commission of Edward IV in c. 1467-8 into the arms of Ireland found them to be blazoned Azure, three crowns in pale Or, bordure Argent (three golden crowns ordered vertically on a blue background with a white border). The association of these arms with Ireland is likely to have originated with Irish magnates (both Norman and Gaelic) who fought in Edward I's Scottish wars at the turn of the 14th century. These were the arms of Edmund the Martyr, which the Irish lords adopted as their banner in the same way as English lords identified with the banner of St. George. However, these arms were also well known in other medieval contexts and are often attributed to King Arthur. It is believed that the three crowns were abandoned as the arms of Ireland after Henry VIII's split with the Papacy. Strictly speaking, following the Norman invasion of the 12th century, Ireland was