|Born||In 188 AC, 189 AC or 190 AC|
|Died||In 209 AC or 210 AC, at King's Landing|
|Book(s)||The Sworn Sword (mentioned)|
Alysanne's father, Ser Eustace Osgrey, was a supporter of Daemon Blackfyre during the First Blackfyre Rebellion. After the defeat of Daemon Blackfyre on the Redgrass Field, all of his supporters who survived and remained in Westeros were made to pay for their lives.
As his sons had all died, Alysanne's father was forced to give her over as a hostage. She was seven when she was taken to King's Landing, where she became a silent sister. At age twenty, she died of the Great Spring Sickness.