Rulers of this kingdom's Piast dynasty included several kings named Casimir and a man who intervened in a Kievan Rus succession crisis, Boleslaw [boh-leh-swaff] the Brave.
This kingdom's capital was governed from a castle built where its founder and his two sons supposedly killed a dragon named Wawel [VAH-vul]. The first ruler of this kingdom seized the Ostmark from Gero II, though he was mostly backed by Emperor Henry II thanks to proselytizing. Landed gentry were favored over rebellious druzyna by a ruler of this kingdom nicknamed "the Restorer"; that king married a woman named Maria to conclude an alliance with Yaroslav the Wise, who seized this kingdom's lands in (*) Red Ruthenia.  Rulers of this kingdom's Piast dynasty included several kings named Casimir and a man who intervened in a Kievan Rus succession crisis, Boleslaw [boh-leh-swaff] the Brave. It later joined an eastern neighbor in the Union of Lublin under the reign of Jagielo. For 10 points, name this medieval kingdom ruled from Krakow.
This kingdom's capital was governed from a castle built where its founder and his two sons supposedly killed a dragon named Wawel [VAH-vul].
Kingdom of Poland [or Polska; or Polonia]