The English word "assassination" and its root "assassin" entered Western languages following the Crusades, derived from the Arabic Hashshashin, a Nizari Ismaili sect active in the 11th and 12th centuries. Before this specific term became a lexical standard to describe the targeted killing of a prominent figure for political or religious motives, several other terms and concepts were employed in classical and medieval literature to describe such acts.

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Classical Latin and Greek Terminology

In the Greco-Roman world, which provided the foundational vocabulary for Western political thought, the most common term for the killing of a person was the Latin caedes (slaughter/killing) or homicidium (homicide). However, when the act involved a political figure, the term sicarius was frequently used.[1] The sicarii were named after the sica, a small curved dagger easily concealed in robes. This term specifically denoted a "dagger-man" or a hired killer. Under Roman law, the Lex Cornelia de Sicariis et Veneficis (Cornelian Law on Dagger-men and Poisoners), enacted around 81 BCE, established legal frameworks for prosecuting those who committed murders with such weapons or through stealth.[2]

In Greek, the term phonos ($\varphi \acute{o}\nu o𝜍$) generally referred to murder or homicide. When the killing was directed at a ruler or tyrant, the specific term tyrannicide (Greek: tyrannoktonos) was employed.[3] This carried a different moral weight than "assassination" does today; in many classical contexts, the killing of a tyrant was viewed as a virtuous act of liberation rather than a criminal deed.

Old English and Germanic Equivalents

Prior to the Norman Conquest and the subsequent influx of Latinate and Arabic-derived terms, Old English utilized the word morþor (the ancestor of the modern "murder").[4] However, in Germanic and Anglo-Saxon law, a distinction was made between slaying (an open killing) and murdrum (a secret killing). A secret killing where the body was hidden or the perpetrator was unknown was considered a more heinous crime because it prevented the victim's family from seeking legal redress or "wergild" (man-price).[5]

The term insidiis (from the Latin insidiae, meaning ambush or guile) was also prevalent in medieval chronicles to describe what we would now call an assassination.[6] Chroniclers writing in Latin before the 12th century would describe a king being killed per insidias—through treachery or ambush—rather than using a specific noun for the act itself.

Biblical and Semitic Contexts

In the Hebrew Bible, the term rachaṣ (רָצַח) is the general verb for "to murder" or "to slay." When describing specific targeted killings, such as the assassination of King Pekahiah by Pekah (2 Kings 15:25), the text uses the verb yakkehu (from nakah), meaning "to smite" or "to strike down."[7] The concept of a "strip of Argov" or other geographical markers often accompanied these historical accounts, but the act itself was described through verbs of striking rather than a specialized noun for political murder.[8]

The Transition to "Assassin"

The shift occurred when European Crusaders encountered the Nizari Ismailis in the Levant. Led by the "Old Man of the Mountain," this group utilized targeted killings as a strategic military tool. Reports by travelers like Marco Polo and chroniclers like William of Tyre brought the term Assasini into European consciousness.[9] By the late 12th and early 13th centuries, the word began to appear in Italian (assassino) and French (assassin) to describe a professional or fanatical killer. It did not fully replace "murderer" in English for political contexts until the late 16th century, famously appearing in William Shakespeare’s Macbeth (c. 1606) as "assassination," which is one of the earliest recorded uses of the noun form in English literature.[10]