Mieszko I of Poland (c. 935 – 25 May 992) established an elite knightly retinue from within his army, which he depended upon for success in uniting the Lekhitic tribes and <answer>preserving the unity of his state</answer>. Documented proof exists of Mieszko I's successors utilizing such a retinue, as well.
Along with uniting the lekhitic tribes what did poland succeed in?
preserving the unity of his state