Question

Marvin, a law-abiding citizen, was involved in a car accident with Mary. During the investigation, it was discovered that Marvin did not have a valid driver's license at the time of the incident. Marvin, however, claims that he was not aware that his license had expired. Mary argues that Marvin should be held liable for damages due to his ignorance of the law.

Discuss the effect and application of the principle of ignorance of the law (Civil Code, Art. 3) in this situation. Would Marvin's claim of ignorance of fact be a valid defense against liability? Explain your answer and provide legal basis.