They were really our elder brothers in the midst of a modest, united family, and it is because of this that they came to occupy their place of honor in public affairs.”[10] Czapski was Chamberlain of Rynkówka in 1752, then Castellan in 1762 and in 1766 became Governor of the Chełmno Voivodeship (1466–1793) until his death in 1802.
[10] Franciszek was a supporter and a close friend of Prince Karol Stanisław "Panie Kochanku" Radziwiłł, one of the most colorful figures of that era.
In Frankfurt, Czapski, then 47 years old, entered into a marriage contract with Prince Radziwill¨s half sister, Princess Veronika Joanna Radziwill (b.
He thought the nobility should see themselves in "the looking glass of virtue, of honor and conscience", and not "reflect false colors, which would disfigure them..."[10] Though his wife Veronica was to bring to their marriage a very important dowry, this was still not paid at the time of Czapski's death in 1802.
[2] This dowry greatly increased the fortunes of the Czapski family and would later help finance their political and collecting activities for various generations.
Czapski married three times: first to Countess Dorota Dzialynska Ogonczyk,[12] then to Zofia Mielzynska[13] and finally to Princess Veronika Radziwill.