include: Tomasz Ostaszewski (1746-1817), bishop of Płock, NereuszOstaszewski (1755-1803), member of the Great Sejm, Teofil Ostaszewski (1807-1889), landlord
(died 1775) – the head of Kościan and Łęczyca, castellan of Nakło. NereuszOstaszewski (born 1755) – Member of the Four-Year Sejm, chamberlain of King Stanisław