A more thorough explanation:

Term: Incendiarius
Definition: Incendiarius is a person who intentionally sets fire to a building or property. It is a term used in Roman law to describe an arsonist.
Examples: John was arrested for setting fire to his neighbor's house. He was charged with being an incendiarius. Another example is when a group of people set fire to a store to protest against the owner. They were all considered incendiarii.
Explanation: The examples illustrate the definition of incendiarius by showing that it is a person who deliberately sets fire to a building or property. In both cases, the individuals intentionally caused damage to someone else's property by starting a fire. This is a serious crime and can result in severe consequences.