Polyxena of Lobkowicz (1566–1642) was a politically active Czech noble and styled Princess of the House of Lobkowicz. She played an important role as the channel between the noble families of Bohemia and the Imperial court in Vienna through her good connection with the Spanish envoy during the counter reformation in Bohemia after 1618. She is the ancestor of several royal families, including that of the Russian Emperors, the kings of Denmark and England, and others.
Inspired by a true story, Invincible recounts the last 48 hours in the life of Marc-Antoine Bernier, a 14-year-old boy on a desperate quest for freedom.