Here's a little background. Alfred Jarry was French writer known for his sharp wit and biting criticism of the conventional. Born in 1873 he lived a short but meteoric life dying in squalor of tuberculosis at the age of 34. While he produced several manuscripts of plays, prose and poems, it was his creation of the character "Ubu Roi" for which he is best remembered.
Cheek by Jowl company attests, remains significant to this day.
Briefly, the story begins with Mère Ubu persuading her husband, Père Ubu, Captain of the Dragoons, to kill King Wenceslas and assume the Crown of Poland. Even though King Wenceslas is about to promote Père to Count of Sandomar, Ubu goes ahead with the scheme and murders the King. The widowed Queen Rosemonde and their son, the Crown Prince Bougrelas, are legitimately frightened and go into hiding where the Queen dies. Ubu Roi becomes completely obsessed with money and power, terrorizing the population to gain more and more dominance. His wife, Mère Ubu, realizes that he is out of control and tries to stop him to no avail - Ubu Roi continues his murderous rampage by eliminating the magistrates and financiers who obstruct him before escaping to Russia.