Geek Girl Authority on X: Happy Birthday to Alexander Ludwig, a.k.a. Björn Lothbrok, a.k.a. Cato! #Vikings #TheHungerGames / X

Vikings fans thrilled as Alexander Ludwig announces next role, TV & Radio, Showbiz & TV

Alexanderludwig Stories - Wattpad

Alexander Ludwig at event of Vikings (2013)

Alexander Ludwig - IMDb

Alexander Ludwig - Wikipedia

Vikings: Alexander Ludwig aka Bjorn Ironside turns 29

Echo des Plaines — zuzcreation: Alexander Ludwig as Bjorn Ironside in

It's Alexander Ludwig's 30th birthday today. Happy birthday, and thank you for bringing Cato to life. : r/Hungergames

Valentine's Day 2016: Happy V-Day From 'Vikings' Bjorn!