Titius
Defined in 2 dictionaries — Cyclopedic (1922), Black's (1910)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
A Roman name commonly used in the civil law in illustrating rules of example, or to designate a fictitious person, like the John Doe of English law.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In Roman law. A proper name, frequently used in designating an indefinite or fictitious person or a person referred to by way of illustration. "Titius" and "Seius," in this use, correspond to "John Doe" and "Richard Roe," or to "A. B." and "C. D."