The next information about him took place in 1310, when he granted two separate districts to his eldest two sons: Siemowit II received Warsaw and Trojden I received Czersk.
Informasi selanjutnya mengenai dirinya berlangsung pada tahun 1310, ketika ia memberikan dua kabupaten terpisah kepada kedua putranya yang paling besar: Siemowit II menerima Warsawa dan Trojden I menerima Czersk.