Gavrilo Princip (Serbian Cyrillic: Гаврило Принцип, pronounced [ɡǎʋrilɔ prǐntsip]; 25 July [O.S. 13 July] 1894 – 28 April 1918) was the man who assassinated Archduke Franz Ferdinand of Austria and his wife, Sophie, Duchess of Hohenberg, in Sarajevo on 28 June 1914. Princip and his accomplices were arrested and implicated a number of members of the Serbian military, leading Austria-Hungary to issue a démarche to Serbia known as the July Ultimatum. This set off a chain of events that led to World War I. Princip was a Yugoslav nationalist associated with the movement Mlada Bosna (Young Bosnia) which predominantly consisted of Serbs, but also Bosniaks and Croats. During his trial he stated "I am a Yugoslav nationalist, aiming for the unification of all Yugoslavs, and I do not care what form of state, but it must be free from Austria."

Gavrilo Princip was born in Obljaj, a poor part of Bosnia, which was then in the Austria-Hungary empire. His parents, Petar, a postman, and Marija (née Mićić) had nine children, six of whom died in infancy. His impoverished parents could not provide for him and sent him to live with an older brother in Zagreb, now the capital of Croatia.

Watler "Wat" Tyler (4 January 1341 – 15 June 1381) was a leader of the English Peasants' Revolt of 1381.

Knowledge of Tyler's early life is very limited, and derives mostly through the records of his enemies. Historians believe he was born in Essex, but are not sure why he crossed the Thames Estuary to Kent. Local tradition in Brenchley was that he was born there.

With news of rebellions of the upper classes in France and Flanders, the English readied for an insurrection. John Ball, Jack Straw and others advocated the destruction of the hierarchical feudal system. Ball, like Tyler, held egalitarian values, though the medieval historian Jean Froissart describes Ball as insane. Other contemporaries suggest that he was involved with the Lollard movement. Such harsh, often unfounded attitudes toward the rebels are common among chroniclers, given that the latter belonged to the educated upper classes, who were usually the targets of rebellion rather than supporters of it. Thus, it is difficult to get an accurate sense of the actual aims and goals of rebels as their side of the story is not represented in historical accounts. Despite this difficulty, Tyler's name does appear in many monk scripts that were discovered throughout the years.