The Celts were a powerful group in central and northern Europe who lived in scattered villages. They spoke their own language and were mainly farmers, though some tribes were known as great warriors. The Celts believed in many nature gods and had traditions like burying the dead with objects for the afterlife. In Britain, Celtic tribes like the Iceni were located across the island and resisted Roman invasion, led by the warrior queen Boudicca after the Romans mistreated her family. Some modern Celtic traditions like Christmas trees are inspired by their beliefs in the power of trees.