"It's me, Shireen! We played together as children in the Red Keep a few times," the former Baratheon princes said. Stannis rarely brought her to King's Landing and when he did, the Cersei Lannister did her very best to keep Shireen away from her children, lest they caught greyscale, regardless of any assurances from the Grandmaester. But Cersei had little power while uncle Robert was still alive.