 Complete the following phrase:  Having lived in turbulent times dynastical struggles with frequent changes on the throne and continual Ottoman threat and expansion, Nicholas adjusted himself to the current circumstances, sometimes changing sides and alliances radically. After supporting King Alberts widow Elizabeth of Luxembourg and her little son Ladislaus the Posthumous in 1439, Nicholas soon took the side of the new king Vladislaus I Jagiellon. When the king lost his life in the 