It's probably the uniform for the 1st Avalon Hussars who became the bodyguard unit for First Prince Harrison Davion after the 1st Davion Guard got their "honored" assignment to Markeson. As for the picture, it's Harrison Davion since the man in the picture shows the shaved neck common to House Sandoval's personal male family hairstyle (Hasek use to have a long mullet until they decided to all become Carrot Top people including Caleb Luvon-Steiner-Campbell-Sandoval-Dead as a Door Nail- Hasek-Davion. Personally, House Hasek should go back to the mullet of Morgan Hasek-Davion. It at the least had dignity.) There is just not a topknot that usually accomplish the look such as with Eric Sandoval-Groell on the cover of Fortress of Lies. Plus, Eric has darker hair, so it ain't Eric.