Ambrose Butterwell's second wife
From A Wiki of Ice and Fire
Ambrose Butterwell's second wife was a member of House Frey, the daughter of Lord Frey, elder sister to Walder Frey, and cousin to Addam Frey. She eventually married Lord Ambrose Butterwell when the latter was around fifty years old. The Whitewalls Tourney was thrown to celebrate their marriage and she fainted when Ser Addam was unhorsed in the tourney.