The Dunstable Swan. Found in a dig in Dunstable, Beds., dates from around 1400. Swans were used often as family devices to relate that family to a Swan Knight of legend, who floated on a river in a boat drawn by swans, to rescue a lady in distress. The most prominent family to use it were the de Bohuns - Henry IV's first wife was Mary de Bohun & apparently the swan became also a Lancastrian symbol after this marriage.
The Dunstable Swan livery badge from the British Museum. Henry IV is known to have had one very similar, which he paid to have mended. The swan was one of the livery symbols of his wife, Mary de Bohun. This has such charm.
Elizabeth Woodville Cosmo, seen on Susan Higginbotham's blog. After marrying the king of England for love she was hated for her family becoming too powerful. Her sons were the famous princes in the tower
Insight on the The Marriage of Edward IV and Elizabeth Wydeville, with author Susan Higginbotham: http://nerdalicious.com.au/history/the-marriage-of-edward-iv-and-elizabeth-woodville-with-susan-higginbotham/