A more thorough explanation:

Definition: Pupillus is a Latin term used in Roman law to refer to a child who has not yet reached puberty and is under the authority of a sui juris tutor. This tutor is responsible for the child's well-being and making decisions on their behalf.

Example: In ancient Rome, if a child's parents died or were unable to care for them, they would become a pupillus and be placed under the care of a tutor. The tutor would manage the child's finances, education, and other important matters until they reached puberty and became legally responsible for themselves.

This term is important in understanding the legal system of ancient Rome and the role of guardianship in protecting the rights of children.