Royal standards of England
The royal standards of England were narrow, tapering swallow-tailed heraldic flags, of considerable length, used mainly for mustering troops in battle, in pageants and at funerals, by the monarchs of England. In high favour during the Tudor period, the Royal English Standard was a flag that was of a separate design and purpose to the Royal Banner.
Source: Wikipedia — Royal standards of England (CC BY-SA 4.0)