I've seen first 3 episodes so far of Vinland. Both these anime have a young male protagonist in a historic time period. Vinland seems to be setting up for a war to take place in it and Arslan Senki was all about wars.
These 2 as a historical anime manages to encompass all the historical aspects, events with the feeling of fantasy and engaging story. Both of them are based in a warlike scenario, teaches the guilt of war and loss and follows the journey of insane character development of MC. They also deal with the reality of war, slavery, and the powerlessness of being poor in a country that only values money and at the same time shows the reasoning and mentality of the oppressors and somewhat reflects the history in making, and from that I mean our history in making.
Both show takes place in fascinating historical setting and stars a young blond-haired protagonist on a adventure to achieve certain goal. Expect war, politics and their consequences themes and lot of strategic battles as well.
Historical setting and Space opera heavy on war drama. Protagonists start as kids who, as a result of certain similar event, develope an interesting talent for war in their teen years and polish them for purpose of revenge.