Who were the ancient Celts?
Strictly speaking the ancient Celts were Iron-Age people who spoke any of a group of closely related languages that are considered a branch of the Indo-European language family. They also shared many cultural and artistic details though they tended toward tribal societal structures and cannot really be spoken of as a specific nation or empire. It should be noted that though Celtic language speaking peoples lived in a tribal culture many of these tribes were enormous and their lands covered geographical areas larger than some of the nations of modern Europe.