Triglav was a trial design for a new command battleship that would replace the Patroclus model. Though the design was sound, after the disaster of an invasion into Imperial territory production was halted, and Triglav became the only one of her kind.
Though she has more forward gun ports than even the Kulishna (80 ports v 60) are smaller (22cm) than the Patroclus design.
Originally Triglev was supposed to mount new reactors, but financial pains forced the reactors from the space carriers to be mounted instead. Nevertheless, this is more power than the standard design, so Triglev is able to fire all her batteries at full power. Her only limitation is overheating, but the fact that Triglev has three separate batteries means she can fire constantly despite overheating.
Triglev was the warship of Dusty Attenborough during his time under Yang's leadership up until the battle at Vermillion starzone. Per the treaty of Balarat, Triglev was scrapped.
Originally Siegfried Kircheis was supposed to get a sister ship to the Brunhild, but Admiral Kircheis declined and instead got the Barbarossa, an improved Brunhild design. It is the only flagship of the entire Imperial fleet to be painted in one color: red, to match the Admiral's hair.
Barbarossa went into battle approximately 60 times, mostly during the Lippstadt conflict where Kircheis put down small rebellions in remote regions. Before this, Kircheis fought Yang Wen-Li in one occasion and participated in the disaster at Amlitzer.
Following Kircheis' death, Barbarossa was moored permanently in birth 2 at Odin's fleet yards, a memorial to the best friend of the most powerful man in the universe.
We can assume in this scenario that Ansbach was successful, and Reinhard died from a rocket-propelled grenade. Taking advantage of the situation, Minister Lichtenlade stirs up the imperial fleet and frames Kircheis for murdering the Kaiser. Having no other choice, the red-hared Admiral surrenders himself to Yang Wen-Li at Iserlorn, switching places with Admiral Merkatz historically.