Attributed Coat of Arms of Enzo, King of Torres and Gallura (according to Matthew Paris)
Paris, Matthew (1250-1255)       Historia Anglorum, St Albans, p. 209  
de Troia, Alessandro. Gli stemmi dei figli di Federico II. Stupormundi.it. Alberto Gentile Editore.
Arms of the Holy Roman Emperor (c.1433-c.1450).svg: Tom-L &amp; Heralder
Shield and Coat of Arms of the Holy Roman Emperor (c.1200-c.1300).svg: Heralder &amp; Tom-L
Attributed Coat and Shield of Arms of Henry VI, Holy Roman Emperor (Codex Manesse).svg: Heralder &amp; Tom-L
Derivate work: The White Lion