High Quality Content by WIKIPEDIA articles! Radvila Astikas (or Astikaitis) (Polish: Radziwill Ościkowicz) (1384, Kernave - 1477) was a Lithuanian magnate, a member of the Astikai family of Vilnius. He was one of the most influential people in the Grand Duchy of Lithuania, was a member of the Lithuanian Council of Lords and was even credited as a pretender to its throne instead of Casimir Jagiellon.