Assertion: empire's son | /r/HasProperty | the reason
Facets:
value: probably
type: DEGREE
Source sentences:
text: This ended the succession plan of the previous four emperors where the emperor would adopt his successor, although Marcus was the first emperor since Vespasian to have a natural son that could succeed him, which probably was the reason he allowed the throne to pass to Commodus and not adopt a successor from outside his family.