Avolon: Os-Nadarra Prime Volume 1
This was his first time ever actually laying eyes on prince avogadro.
Os-Nadarra Prime Volume 3: Hunted
"it concerns the heir apparent, crown prince avogadro lo'raven, son of king christopher and queen annabelle lo'raven." when he saw he had their attention, he continued.
War of the Wolf: Tartan King
"p-prince avogadro?" ~~~~~ the howling forced avogadro from his sleep, waking with a start and brandishing his sword, eyes taking in the room around him expecting to find an intruder.
Os-Nadarra Prime Volume 2: Red Winter
In the city, prince avogadro walked out onto his balcony as he saw the snowflakes falling, staring with awe at the skies above.
Kingdoms: Return to Avolon
"only because of you, prince avogadro," he said, "i'd likely have died where i fell if you had not gone to my people for help."