Question: Who is Konrad Iii Rudy's paternal grandmother?
Answer: Anna Feodorovna

He was Duke of Warsaw during 1429–1454 (under regency until 1436) and sovereign Duke of Podlachia in 1440–1444. He was the second son of Bolesław Januszowic (in turn second son of Janusz I of Warsaw) and Anna Feodorovna of Ratnie, a Lithuanian princess (granddaughter of Algirdas).