The White Hart

Richard II’s badge from the Wilton Diptych, 1396. 

The White Hart ('hart' is an archaic word for a mature stag) was
 the personal emblem and livery of Richard II, who derived it from the 
arms of his mother, Joan 'The Fair Maid of Kent', heiress of Edmund of Woodstock
In the Wilton Diptych, which is the earliest authentic contemporary portrait of an 
English king, Richard II wears a gold and enamelled white hart jewel, and 
even  the angels surrounding the Virgin Mary all wear white hart badges. 

Richard II of England (1367-1400). 
Engraved by Bocquet and published in the Catalogue of the 
Royal and Noble Authors, United Kingdom, 1806

Since time immemorial, the white hart has been a creature 
surrounded by mystery, a beast whose very existence is suffused 
with myth and legend. An inescapable part of British folklore, its mystical 
quality led to it being adopted as a symbol of royalty, which is why a 
multitude of White Hart pubs is scattered around the country

'White Hart' by Mark Hearld