Christian Ludwig von Kalckstein

[2] He entered the Polish army in 1654, but fought for Duke Frederick William at the 1656 Battle of Warsaw, for which he was rewarded with a captaincy in the district of Oletzko (Olecko).

[2] After Albrecht's 1667 death, his sons disputed the inheritance; Christian Ludwig was accused by his siblings of conspiring to murder Frederick William and invite Polish troops into Prussia.

[3] Upon the arrival of the duke in the Prussian capital, Königsberg, the following year, Kalckstein begged for mercy and had his sentence reduced to a fine[3] and exile to his estate.

[4] Frederick William was alarmed that the rebellious Kalckstein would inspire opposition in the estates, which met in July 1670 to discuss the duke's requests for funds for his army.

[citation needed] Von Kalckstein was the prototype for the character of Krzysztof Dowgird in a popular 70's Polish TV action series Czarne Chmury (Dark Clouds).