La esfinge. Alleras.

Who is Alleras?
westeros.org/Citadel/FAQ/

And so Ned had come striding into the council chambers, bonetired and dressed in borrowed clothing, to find four members of the small council waiting for him.

The chamber was richly furnished. Myrish carpets covered the floor instead of rushes, and in one corner a hundred fabulous beasts cavorted in bright paints on a carved screen from the Summer Isles. The walls were hung with tapestries from Norvos and Qohor and Lys, and a pair of Valyrian sphinxes flanked the door, eyes of polished garnet smoldering in black marble faces.

The councillor Ned liked least, the eunuch Varys, accosted him the moment he entered. "Lord Stark, I was grievous sad to hear about your troubles on the kingsroad. We have all been visiting the sept to light candles for Prince Joffrey. I pray for his recovery." His hand left powder stains on Ned's sleeve, and he smelled as foul and sweet as flowers on a grave.

Y así fue cómo llegó Ned a la cámara del Consejo, muerto de cansancio y vestido con ropas prestadas. Cuatro consejeros aguardaban su llegada.

La cámara tenía una decoración suntuosa. El suelo estaba cubierto de alfombras de Myr, en vez de esteras, y en un rincón había un biombo tallado, procedente de las Islas del Verano, en el que aparecían un centenar de bestias fabulosas pintadas en colores brillantes. De las paredes colgaban tapices de Norvos, Qohor y Lys, y un par de esfinges valyrianas flanqueaban la puerta, con ojos de granates tallados que brillaban en las cabezas de mármol negro.

—Lord Stark, me entristecieron mucho las noticias de los problemas que surgieron durante el viaje. Todos hemos visitado el sept y encendido velas por el príncipe Joffrey. Rezo por que se recupere pronto.- La mano del eunuco manchaba de polvo la manga de Ned. El eunuco desprendía un olor desagradable y dulzón, como el de las flores de los cementerios.

Eddard, AGoT

The Sphinx was always smiling, as if he knew some secret jape.

And like the green marble sphinxes that flanked the Citadel’s main gate, Alleras had eyes of onyx.

TheSphinx looks slight, but there’s strength in those slim arms, he reflected, as Alleras threw a leg across the bench and reached for his wine cup. “The dragon has three heads,” he announced in his soft Dornish drawl.


“Is this a riddle?” Roone wanted to know. “Sphinxes always speak in riddles in the tales.”
“No riddle.” Alleras sipped his wine.

“The sphinx is the riddle, not the riddler.”

“The dragon must have three heads,”

“An acolyte. Alleras, by some called Sphinx.”
The name gave Sam a jolt. “The sphinx is the riddle, not the riddler,” he blurted. “Do you know what that means?”
“No. Is it a riddle?”
“I wish I knew. I’m Samwell Tarly. Sam.”

Alleras, Aemon, Sam. AFfC