Ginga Eiyuu Densetsu, Densetsu no Yuusha no Densetsu Recommendations
No, this recommendation is *NOT* because Legend of Legendary = Legend of Galactic. Going in, I was aware of the similarity between the titles and thought they ended there. They didn't.
Oberstein in Galactic and Miran in Legendary play the exact same role: convincing an initially idealistic king/commander to do evil for the sake of the greater good. Where as the rest of Reinhard & Sion's war councils wouldn't dream of using underhanded tactics and/or sacrificing innocents, Miran & Oberstein would do anything to bring about the required results. Their characters exist to bring out the darkness lingering behind idealism.
It's worth noting that in Legendary Miran
Apart from both titles containing the words "legend" & "Heroes". Both stories are similar despite the different settings. A lesser noble trying to unite the Universe/Continent to attain peace for everyone. All this possible due to their best friend being their motivation. Also both being advised by people with questionable motives.
Legend of the Legendary Heroes not as deep as Galactic Heroes but still a good show.