 Complete the following phrase:  It is known that Kristinas Astikas had four sons: Radvilas, Stanislovas sometimes also called Stankus, Mikalojus and Baltramiejus. Radvila Astikas died in 1477 was voivode of Trakai and became an ancestor of a new family, known as Radvilos. Later the name was polonized to Radziwiłł. Since there is nothing known about Mikalojus and Baltramiejus, historians assume they died in their youth. Stanislovas became a voivode of Navahrudak and continued the Astikai family line. His son Gregory became Court Marshal in 1494. As a vicegerent of Anykščiai and Merkinė, he participated in the 