Assertion: dragon | /r/HasProperty | introduced as heraldic symbols
Facets:
value: by king peter iv of aragon
type: TEMPORAL
Source sentences:
text: Dragons were introduced as heraldic symbols by King Peter IV of Aragon, who used a dragon on his helmet to show that he was the king of Aragon, as a heraldic pun (Rei d'Aragón becoming Rei dragón; translating in English as "dragon king").