Arms (ancient) of Dering of Surrenden in Kent (Dering baronets): Argent, a fess azure in chief three torteaux. Arms (modern) of Dering of Surrenden Dering, Kent (Dering baronets): Or, a saltire sable. Formerly the arms of de Morinis. According to Edward Hasted ('Parishes: Pluckley', in The History and Topographical Survey of the County of Kent: Volume 7 (Canterbury, 1798), pp. 463-478[1]) "Sir John Dering, of Westbrooke, in Lyd, died anno 38 Edward III. his arms, A fess, in chief, three roundells, being carved in stone on the roof of the cloysters at Canterbury. He was father of Sir Richard Dering, of Hayton, who was lieutenant of Dover castle in king Richard II.'s reign, whose seal affixed to a deed in the Surrenden library is a shield of his arms, A fess, in chief, three roundells; on each side, A horse, sejant, on a ducal crown, placed on a close helmet, mantled; the legend, Sigillum Ricardi Dering, Militis. He lies buried in Lyd church; his son John Dering, esq. of Westbrooke, who married Christian Haut as before-mentioned, seems to have been the first who assumed the arms of de Morinis, being the saltier, instead of those of Dering, which latter his descendants transferred and afterwards constantly bore in the second quartering of their arms. The Dering baronets bore a shield of Argent, a fess azure in chief three torteaux (Dering (ancient)) quartering Or a saltire sable (de Morinis). (Montague-Smith, P.W. (ed.), Debrett's Peerage, Baronetage, Knightage and Companionage,  Kelly's Directories Ltd, Kingston-upon-Thames, 1968, p.242; Burke, Sir Bernard, The General Armory, London, 1884, calls the torteaux arms an augmentation.). Hasted: 

"THE FAMILY of Dering, as appears from the family papers and manuscripts in the Surrenden library, and from other evidences, is descended from Norman de Morinis, whose ancestor Vitalis Fitz Osbert lived in the reign of king Henry II. and married Kineburga, daughter of Deringus, descended from Norman FitzDering, sheriff of this county in king Stephen's reign, who married Matilda, sister and heir of William de Ipre, earl of Kent; and at the battle of Lincoln, in which king Stephen was taken prisoner, was slain near the king's person, and being found afterwards with his shield covered with blood, his posterity were allowed to add to their paternal coat of arms, the three torteauxes in chief, in memory of his bravery, being a descendant of that Dering who is mentioned in several parts of the Textus Rossensis, and in the Book of Domesday, as holding lands in Farningham in the time of the Saxons, before the conquest. They had issue Deringus de Morinis, whose son Deringues Fitz-Dering was the first who deserted the name of Morinis"