Japan
Medieval Japan was all about honer and place in the society. Emperors ruled the castles and were well known for how they performed in battles to take over other Emperors land. Civil war become a continues part of life in Japan. People of the lower class tried everything to become the ruler of each of the provinces, from trying to miearr the Shoguns/Emperors daughter even if they couldn't stand her it was so that family was not fighting to stay alive and could become the ruler. Castles were built in every state and the rulers of them had to be prepared to die in battle if their castle was under attack(seppuku), it was seen as honorable to die that way then to be captured.