Ukrainian (Zaporozhian) Cossacks оf XVI-XVIII centuries had a charismatic view as a warriors and spectacular battle skills. Also they made a great influence on a whole european history.

This topic brings a wide possibility to create:

1. Unique bright characters with their own system of martial arts (including "hopak" — cossacks' battle dance) and tons of different weapons.

2. Exciting story: bloody battles, friends and betrayers, ceaseless division of territories and power.

3. A great land with beautiful architectural monuments of different ages: Kievan Rus', Gothic, Renaissanse, Baroque, Classicism, Muslim and even Armenian national architecture — and all of this in one country! Kiev, Lviv, Kamianets-Podilskyi... Hundreds of fortresses, palaces and temples, standing in the meeting point of catholic, orthodox and muslim worlds.

Also it will bring you tons of money. Ukraine became enormously popular in the view on the recent events. =)

http://en.wikipedia.org/wiki/Zaporozhian_Cossacks

http://en.wikipedia.org/wiki/Cossack_Hetmanate