this flag is recorded as the flag of Ireland by 18th- and 19th-century sources. It was used as a naval jack and as the basis for the unofficial green ensign of Ireland, particularly during the 18th and 19th centuries. The flag is identical to the arms of the province of Leinster. It is believed that the Leinster arms are derived from it, rather than the other way around. Arms and Flag of the Four Provinces The arms of the four traditional provinces of Ireland are popularly displayed quartered as arms of Ireland. The quartering is usually in the order Leinster first, Connacht second, Ulster third and Munster fourth. The resulting arms are frequently displayed in the form of a banner. They also appear as charges in other arms and emblems. For example, the arms of the Genealogical Office, which is headed by the Chief Herald of Ireland, are the four provinces shown quartered beneath a chief Gules, charged with a Tudor Portcullis Or between two Scrolls Argent (a red band with a gold Tudor portcullis between two silver scrolls). The arms of Leinster (Vert, a Harp Or, stringed Argent) are believed to have likely evolved from the arms of Ireland itself with a change of tincture. Similarly, Munster's arms (Azure, three antique crowns Or) are thought to have been derived from those of the former Lordship of Ireland, or from the short-lived dukedom of Ireland created for Robert de Vere in 1386. The crowns now usually depicted as "antique" or "eastern": a gold rim with eight sharp, triangular rays, of which five are seen. The arms of Ulster are the arms of the de Burgh, Earls of Ulster, combined with the red hand seal of the O'Neills. These two dynasties and symbols are inseparably linked to Ulster. The combination of them is blazoned Or, on a Cross Gules, an inescutcheon Argent, charged with a dexter hand erect aupaumee and couped at the wrist Gules. Finally, Connacht's arms are blazoned Party Per Pale Argent and Azure, in the first an eagle dimidiated and displayed Sable in the second issuant from the partition an arm embowed and vested, the hand holding a sword erect, all Argent. These are believed to have been adopted from the arms of the medieval Schottenklöster (Gaelic monastery) in Regensburg, Germany. The arms of the Regensburg Schottenklöster, which date from at least the 14th century, combined the arms