Caesonia is a feminine name of Roman origin, known primarily as the name of the last wife of the Roman Emperor Caligula. It is the feminine form of the Caesonius family name, itself derived from the praenomen Caeso. The root word caesius means "blue-grey," possibly referring to eye color or a characteristic of the sky. Historical Context Milonia Caesonia (died 24 January AD 41) was the fourth and last wife of the notorious Roman emperor Caligula. Their marriage began in AD 39 and ended tragically when both were assassinated in AD 41. Little is known of her early life; she was born toward the beginning of the first century, with her birthday celebrated between 2 June and 4 June. Her mother was Vistilia, a woman known for her numerous children. Initially, it was believed that Caesonius Maximus was her father, but some modern historians argue that a Milonius may have been her father instead. The gens Caesonia was of relatively modest origin but had gained prominence during the early Principate. According to ancient sources, Caesonia was a beautiful and kind woman who loved Caligula deeply. She gave birth to their daughter Julia Drusilla shortly after her marriage. After their deaths, the short period of their rule and infamy made Caesonia remembered, albeit in scattered historical fragments. Cultural and Linguistic Significance The name Caesonia follows the common Roman pattern of forming feminines from gentile names (e.g., Julia from Juliu, Claudia from Claudius). It is not a common name in later centuries, primarily surviving in historical texts, dictionaries, and among rare classical name choices in the modern era. The name has no significant religious connections outside of ancient Roman paganism. Related Names and Variants Masculine forms directly connected to this name via chain include Caesonius (the overarching family name) and Caeso (the original praenomen). Conversely, no common modern language versions survive as day‑to‑day equivalents place names. Meaning: Feminine form of Caesonius (ultimately “blue‑grey”) Origin: Roman Latin Type: First name, feminine Historical Usage: Imperial Roman period