Sonja is a fictional character from the Underworld series of films. This character is the daughter of the vampire elder Viktor, introduced by flashback, in Underworld. Red Sonja, the She-Devil with a Sword, is a fictional character who first appeared in Conan the Barbarian #23 (Marvel Comics).
tetralogy (plural tetralogies) 1  A set of four works of art that are connected, and that can be seen either as a single work or as four individual works. They are commonly found in literature, film, or video games. ( 2 medicine) A combination of four symptoms.
Historical Examples. 1  This first part of the tetralogy, which is the prologue, was not divided into acts. 2  The work of Gringore, just noticed, forms part of such a tetralogy. 3  The first act of Siegfried is one of the most dramatic in the tetralogy. 4  He must be competently instructed in the tetralogy, or first four rules.