Fig. 675.—Royal arms granted by King Richard II to Thomas de Mowbray, 1st Duke of Norfolk (1366-1399), showing the ostrich feather badges/supporters. <i>Azure, a cross flory between five marlets or</i> (attributed arms of Edward the Confessor, King of England) impaling arms of Plantagenet with <i>a label of three points argent</i> for difference (for Thomas of Brotherton, 1st Earl of Norfolk). Arms granted to Thomas de Mowbray, 1st Duke of Norfolk (1366-1399) by King Richard II, who had himself adopted in his own arms a similar impalement by the attributed arms of Edward the Confessor, with whom he had a "mystical union". (Source: Complete Guide to Heraldry Fig 675). Shield at dexter: <i>Gules, a lion rampant argent</i>
(Mowbray); shield at sinister: <i>Sable, a lion rampant argent crowned or</i> (Segrave). Thomas de Mowbray, 1st Duke of Norfolk was the second son of <a href="//commons.wikimedia.org/w/index.php?title=John_de_Mowbray,_4th_Baron_Mowbray&amp;action=edit&amp;redlink=1" class="new" title="John de Mowbray, 4th Baron Mowbray (page does not exist)">John de Mowbray, 4th Baron Mowbray</a>, and Elizabeth de Segrave, <i>suo jure</i> Lady Segrave, daughter and heiress of <a href="//commons.wikimedia.org/w/index.php?title=John_de_Segrave,_4th_Baron_Segrave&amp;action=edit&amp;redlink=1" class="new" title="John de Segrave, 4th Baron Segrave (page does not exist)">John de Segrave, 4th Baron Segrave</a>, by <a href="//commons.wikimedia.org/w/index.php?title=Margaret,_Duchess_of_Norfolk&amp;action=edit&amp;redlink=1" class="new" title="Margaret, Duchess of Norfolk (page does not exist)">Margaret, Duchess of Norfolk</a>, daughter and heiress of <a href="//commons.wikimedia.org/w/index.php?title=Thomas_of_Brotherton,_1st_Earl_of_Norfolk&amp;action=edit&amp;redlink=1" class="new" title="Thomas of Brotherton, 1st Earl of Norfolk (page does not exist)">Thomas of Brotherton, 1st Earl of Norfolk</a>, a son of King <a href="//commons.wikimedia.org/w/index.php?title=Edward_I_of_England&amp;action=edit&amp;redlink=1" class="new" title="Edward I of England (page does not exist)">Edward I</a>. Compare with ostrich feather supporters/badge of John Beaufort, 1st Duke of Somerset (d.1444), KG <a href="//commons.wikimedia.org/wiki/File:GarterPlateJohnBeaufort.jpg" class="image"><img alt="GarterPlateJohnBeaufort.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/GarterPlateJohnBeaufort.jpg/100px-GarterPlateJohnBeaufort.jpg" decoding="async" width="100" height="137" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/GarterPlateJohnBeaufort.jpg/150px-GarterPlateJohnBeaufort.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/GarterPlateJohnBeaufort.jpg/200px-GarterPlateJohnBeaufort.jpg 2x" data-file-width="967" data-file-height="1322"></a>
<bdi><a href="https://en.wikipedia.org/wiki/en:Arthur_Charles_Fox-Davies" class="extiw" title="w:en:Arthur Charles Fox-Davies"><span title="British writer (1871-1928)">Arthur Charles Fox-Davies</span></a>
</bdi>
A Complete Guide to Heraldry.