Dwor (dwór)

Dwór: court, the residence of a sovereign, manor, estate, farmstead, homestead.

or

Dwór: collective body of the retinue of a sovereign; formal assembling of the retinue of a sovereign.

Zych from Zgorzelice

 Zych from Zgorzelice is a neighbor of Macko and Zbyszko and father of Jagienka.

Tatars

 The Tatars is an umbrella term for different Turkic ethnic groups bearing the name "Tatar." Initially, the ethnonym Tatar possibly referred to the Tatar confederation. That confederation was eventually incorporated into the Mongol Empire when Genghis Khan unified the various steppe tribes. 

Historically, the term Tatars (or Tartars) was applied to anyone originating from the vast Northern and Central Asian landmass then known as Tartary. This term was also conflated with the Mongol Empire itself. More recently, however, the term has come to refer more narrowly to related ethnic groups who refer to themselves as Tatars or who speak languages that are commonly referred to as Tatar, namely Tatar by Volga Tatars (Tatars proper), Crimean Tatar by Crimean Tatars, and Siberian Tatar by Siberian Tatars.

Jasko of Teczyn, Castellan of Krakow

 In the book Jasko of Teczyn is a Catellan of Krakow.

Jan (or Jasko) of Teczyn, (born between 1408–1410, died on July 6, 1470) - the castellan of Kraków in the years 1459–1470, the voivode of Kraków in the years 1438–1459, the voivode of Sandomierz in the years 1437–1438, the castellan of Wojnica in the years 1435–1437, guardian of the Kraków land in the years 1434–1436, the starost of Lublin in the years 1434–1438, the castellan of Biecz in the years 1433–1435.

For a quarter of a century, he was the most powerful magnate in Poland. It seems that the book's character is based on Jan, but the story itself takes place around 1410.