Carolus Rex is the sixth studio album by Swedish heavy metal band Sabaton. It was released with both English/mixed and Swedish vocals. It is the last album to feature guitarists Oskar Montelius and Rikard Sundén, drummer Daniel Mullback and keyboardist Daniel Mÿhr. It was produced by Peter Tägtgren in Abyss Studios. The album received positive commercial acclaim, achieving gold certified in Poland and platinum in Sweden.