As Tiergan kindly said, Brynhilde is Ala Mhigan. She was roughly 18 when Ala Mhigo fell, and so witnessed (and was very much affected by) both the fall of the King of Ruin and Garlemald's coup.
She was heavily involved in the Resistance from its early days, and spent some time in Little Ala Mhigo. Hers was a name well-known among the refugees at the time, although it's likely that as she distanced herself from the Resistance in later cycles, she wouldn't be known to the younger 'Mhigan orphans.
She was heavily involved in the Resistance from its early days, and spent some time in Little Ala Mhigo. Hers was a name well-known among the refugees at the time, although it's likely that as she distanced herself from the Resistance in later cycles, she wouldn't be known to the younger 'Mhigan orphans.