The young man dates his parents’ marriage to the year of the raid. The account also includes old place and lineage terms, including Sarūḥ and Ghassān.
«أَنَّهَا نَكَحَتْ عَامَ الْغَارَةِ»
That she married in the year of the raid.
Nakaḥat is a feminine past-tense verb whose subject is the mother. ʿĀm means year, and al-ghāra refers to a raid. These are internal time and lineage details of the character’s account; they do not warrant inventing a precise historical date.