Celts and Druids; a mystical piece of history rooted in the nature around us. I have summarized my own knowledge of this people and their Wise Men below.
Although the Celts and Druids (perhaps?) chose to put almost nothing in writing, we can draw much of our knowledge from the writings of their neighbors and other contemporaries. Keep in mind that the knowledge is also colored by the vision of the notulist. I say choose it because, for example, the Ogham and the many stones proves that there were indeed writing abilities. Another possibility is that many of these legacies have been lost over the years. After all, history is often told and/or written by the victor.
Below is an explanation of what I have been able to find and remember over the years. This knowledge comes from books, visiting museums and conversations. It is therefore very difficult to give a citation of this.
The Celtic periods can be roughly summed up in the Hallstatt period which took place approximately between 1000.C BC and 500.C BC and the La Tène period which existed from 500.C BC until after the beginning of our era. On the right is a good look at how big the Celtic empire must have been. This map also shows the areas that have been able to hold it along and sometimes still use the language themselves.
The Hallstatt period
In the Hallstatt period, the Celts seem to be mainly engaged in trade with their Greek neighbors. They were mainly concerned with extracting salt, which at that time is a very good thing. They were also masters at iron processing. Through this flourishing trade, a lot of wealth flowed in the direction of the Celts. This can be seen in the valuables we find in the burial mounds. At that time, the Celts were one of the first peoples in Europe to bury their dead instead of burning them.