Question: Anna Jagiellon, was Queen of Poland and Grand Duchess of Lithuania in her own right from 1575 to 1586, she was a daughter of Polish King Sigismund I the Old and his Italian wife, which member of the powerful House of Sforza, which ruled the Duchy of Milan since 1447?
Sentence (from "Goštautai"): Their only serious rivals were the Kęsgailos, and from the end of the 15th century the fast rising in power and influence Radziwiłł family clan.
Relevant evidence: No