From A Wiki of Ice and Fire
|Allegiance||House Lannister of Lannisport|
|Book(s)||A Feast for Crows (Mentioned)|
A Feast for Crows
Rosamund was sent as a handmaiden to Princess Myrcella Baratheon when the princess went to Dorne. She was chosen by Tyrion Lannister to accompany her due to similarities in height and looks from afar. When Ser Arys Oakheart brought Princess Myrcella to Arianne Martell, he disguised Rosamund as Princess Myrcella and claimed the princess had redspots, which would keep most people away in Sunspear, long enough for Ser Arys to be gone.