Utawarerumono, Guin Saga Recommendations
"Utawarerumono" is one of the many other works of Japanese fantasy to have been inspired by the "Guin Saga". The similarities are obvious ^^
Both are about masked man with no memories being cought in battles and politics.
Both are about a war and both main characters are great strategists.
The main character in Utawarerumono wears a mask he can not take off and has lost all his memories
As others have stated, Utawarerumono is clearly based upon the original Guin Saga novels. Both feature a mysterious masked man with no memories rescued by and protecting two siblings. Both series are about fighting for freedom against an oppressing and more advanced kingdom. Even many of the side characters are similar.
The only real difference is that Utawarerumono is much more 'anime-like', whereas Guin Saga feels much more Westernized.