What is "danielewicz"

Danielewicz vel Danilewicz of Ostoja coat of arms was a noble family name in Lithuania and in the Polish–Lithuanian Commonwealth. On the political scene Danielewicz supported the Clan of Ostoja expansion in the 15th century and in Lithuania was one of the closest families related to the Pac family supporting their way to the suprimacy in Grand Duchy of Lithuania at the end of the 17th century. In medieval times, nobles in Lituania with power of judging like Danielewicz where called barones according to Jan Długosz.