Thank you for the link.  Interesting to note that the boundary of the City of London is marked by a dragon statue https://en.wikipedia.org/wiki/Dragon_boundary_mark  Whereas one of Christianity's most famous saints, St. George, is portrayed slaying a dragon. https://www.ancient-origins.net/history-famous-people/exploring-famous-legend-st-george-and-dragon-005794 This page about St. George (Georgios Gerontios) doesn't mention a dragon.    One wonders how the The City of London, the bread basket for bankers, has a dragon (not slayed) marking the boundary to the city. Some background on the crest :   A primitive form of the crest first appeared in 1539 on the reverse of a new common seal. This showed a fan-like object bearing a cross. Over time this evolved into a dragon's wing, and was shown as such in 1633 when it appeared above the city's coat of arms in the frontispiece to the fourth edition of John Stow's Survey of London. The wing is specified as a dragon's "sinister" wing, i.e. its proper left wing. It has been speculated that the use of a peer's helmet (rather than that of a gentleman, as appears in other civic arms) relates to the use of the honorific prefix "The Right Honourable" by the Lord Mayor.[4] The helm was confirmed in 1957.[1] However, there are various representations that show the arms surmounted by a "Muscovy Hat", as worn by the City Swordbearer during the Stuart and Georgian periods: a notable example is seen carved above the main southern entrance to Guildhall.