Trevalion holds Pointe des Soeurs, the point closest to Alba (KJ 402),
and is presumably the sovereign duchy in Azzalle.
House Trevalion's personal quarters are on the third floor of the
Palace (KJ 8).
Sea-grey eyes run in the Trevalion family: Baudoin and Bernadette both
have dark hair and grey eyes (KJ 9).
Marc, Duc de Trevalion, married Lyonette de la Courcel.
They had two children: Baudoin and Bernadette.
Baudoin attended the University of Tiberium, until he was expelled for
unnamed escapades (KD 50). He played the Sun Prince when Phèdre was
10. He and Lyonette were executed for treason.
Marc and Bernadette were exiled, then recalled to cement Ghislain de
Somerville's place in Trevalion -- Bernadette and Ghislain were
married. The inheritance of Trevalion (and presumably Somerville)
hangs on their son, Bertran de Trevalion. He is roughly
Imriel's age (KS 196).
**spoilers for Scion**
Bernadette hired a man to kill Imriel while he was in Tiberium.
Gaspar Trevalion, the Comte de Forcay, was a friend of
Delaunay's and cousin of Marc's. He became friends with Solaine
Belfours while she was fostered at Trevalion.