The term 'European of the Iron Age' refers to a group of people known as Celts, who lived in Europe during the Iron Age. The Celts were a diverse group of people who spoke a variety of languages and shared a common culture. They were known for their art, metalworking, and warfare. They were also known for their religious beliefs, which included druidism and polytheism. The Celts were a major force in Europe during the Iron Age, and their influence can still be seen today.