Antonia Minor
The relationship between a free citizen and a slave or between slaves was known as "contubernium". The term describes a wide range of situations, from simple sexual slavery to quasi-marriage. For instance, according to Suetonius, Caenis, a slave and secretary of Antonia Minor, was Vespasian's wife "in all but name", until her death in AD 74. It was also not uncommon for slaves to create family-like unions, allowed but not protected by the law.