is also evident by the fact that no other coats of arms is borne by more families. Paprocki says, in O herbach, that several hundred years ago the clan called themselves simply Jastrzebczyks. Not until after the days of Archbishop Wojciech of Gniezno did foremost members of this house began to write z Rytwian ("from Rytwiany"). Other members similarly named themselves after the estates they possessed. Jastrezebiec's antiquity lead others coat-of-arms to be derived from it, including Dąbrowa, Zagłoba, and Pobóg. These arms are also called Boleszczyc, in Silesia, and Lazanki, in Mazovia. In other places Jastrzebczyks are called by names coming from the word for "goshawk", Kaniowa or Kudbrzowa. In Paprocki's day there was a Jastrzebiec castle, belonging to the Zborowskis; General Piotr Zborowski from Rytwiany, Kraków voivode, tore it down, dug it out, and had a large pond put in its place. Ancestors of this house Based on a grant of privilege to a monastery in 999, Paprocki cites the most ancient member of this house as being a castellan of Sandomierz, a man named Mszczuj. Mszczuj's two sons Mszczuj and Jan, who signed themselves "from Jakuszewice", were both made canons in Kraków by Bishop Lambert in 1061. In 1084, Dlugosz wrote that the Jastrzebczyks who came from Hungary with Mieczyslaw, son of Boleslaw the Bold. Derszlaw was cup-bearer for King Bolesław Wry-mouth in 1114. Bolesław IV the Curly granted the title to the villages of Jakuszewice and Kobelniki to Derszlaw's sons Wojciech and Derszlaw, of whom Wojciech was the Sandomierz standard-bearer. Paprocki cites a fragment of his in O herbach, but the long stretch of time between them and their father, 166 years, indicates that they were not the sons of Derszlaw the cup-bearer. Paprocki cites a monastery grant of privilege given in 1199 for Borzywoj and Derszlaw Jastrzebczyk, heirs to Jakuszowice. He also includes Piotr, son of Wojciech, the Sandomierz standard-bearer. Swentoslaw, a pastor from Poznań and Gniezno canon, was chosen to be bishop of Poznań; already of an advanced age, he had retired, but he yielded to those urging him and accepted the office. He spent only a year at this see before his death in 1176 and was buried in the church. Nakiel. w Miechov. fol. 66, praises the good works of this Swietoslaw, for saving his monastery at its beginning with generous alms; he ascribes to Swietoslaw the Pobog arms. Yet Długosz in