In 1310 he offered some of Masovia to his son (the Duchy of Warsaw and the Duchy of Czersk).
By 1321, Casimir I married Euphemia (b. 1310 – d. aft. 11 January 1374), daughter of Duke Trojden I of Czersk-Warsaw.
Starting from 1990 – Systematic development of modern infrastructure (potable water system, sewer system and wastewater treatment plants (Czersk and Rytel), heating gas distribution, development of modern road system, modernisation of railroad);
While Siemowit's son Duke Konrad II (1264–1294) moved his residence to Czersk he and his brother Boleslaus II entered into a long-term conflict over the Polish seniorate with their Kuyavian relatives and the Silesian Piasts, which estranged them from the Piast monarchy.
She was the fourth daughter and youngest child of Casimir I, Duke of Cieszyn, by his wife Euphemia, daughter of Duke Trojden I of Czersk-Warsaw.
In 1374 he inherited Zakroczym and in 1381 the lands of Czersk, Liw and Wyszogród as the result of partition of Masovia between his younger brother Siemowit IV and himself.
Originally, their main settlements were in the area of Płock, Łomża, Wizna, Czersk, Ciechanów, Płońsk, Zakroczym and Grójec.
Different capitals of individual former duchies of Mazovia also include Czersk and later Warsaw.
In 1310, when his father was still alive Trojden received the small region Czersk.
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Kurkowo, Pomeranian Voivodeship, a village in the administrative district of Gmina Czersk, Poland
# Operational Group "Czersk" (Grupa Operacyjna Czersk) under gen. Stanisław Grzmot-Skotnicki
Siemowit gave the small region of Warsaw to his brother Casimir, retaining the regions of Czersk, Liw and Rawa.
At the start of the Invasion of Poland in 1939, he commanded his unit as the core of the Czersk Operational Group which was to shield the Vistula river crossings against the German offensive and to protect the flanks of the Pomorze Army.
General Wiktor Thommée, who commanded Piotrków Operational Group of Łódź Army, ordered Colonel Czyżewski to defend a 25-kilometer line in the area of Rozprza.
The 6th Corps (Konjic) was formed in June 1993 from the 4th Corps Northern Herzegovina Operational Group, to occupy northern Hercegovina from the HVO and eventually reach the Adriatic coast.
Rajić operated out of the central Bosnian town of Kiseljak as the Commander of the Second Operational Group of the HVO’s Central Bosnia Operative Zone.
In mid-September 1939 Edward Rydz-Śmigły reformed the Śląsk Operational Group into Operational Group Jagmin.
# Operational Group "Śląsk" (Samodzielna Grupa Operacyjna Śląsk) under gen. Jan Jagmin-Sadowski (on September 3 renamed to Operational Group "Jagmin" (Grupa Operacyjna Jagmin))
# Operational Group Grzmot-Skotnicki (Grupa Operacyjna Grzmot-Skotnicki) under Stanisław Grzmot-Skotnicki
In February 1993 he was made commander of operational group Zapad of the 3rd Corps of the Army of the Republic of Bosnia and Herzegovina in Bugojno.