A "kingdom, was run like a large company. Their were many lesser Kings, sometimes called Lords, who all ruled their own areas but followed the middle or main Kings rule. Lesser Kings and Queens were called Lords Or Ladies, hence the titles we get in Northern European Traditional pagan groups. These lesser Kings would rule the island or land of their area split into 12 to 5 areas.
A High King was a skilled warrior, chosen by the many tribes, who was only used to rally the clans together during times when they had a mutual cause or threat, therefore, this style of King, was not always put in down in history books unless he lasted through many battles or changed history in some way. These only ruled during the time of the threat, and then the Tribes would go back to their own affairs. In ancient times, in most cultures, these famous Kings & Queens were thought of as the living Gods in physical form. Kings and Queens were considered part of the Noble class below.
We also must remember that each area of tribes had their own similar but slightly different set of laws which they lived by and these dictated the hierarchy as well. Every hierarchy is different. There are many books which tell us some of the areas and their ways. lets look at this more closely;
In Munster, Ireland, for example, they had several ruling families (the lords). These families were called Septs. Each of these belongs to one tribe. Which means they all shared a common ancestor, and Munster's was Eoghanacht. In Ireland, First was the King, who oversaw the entire land with allegience of the lesser Lords who ruled over their own large territories, often known as the "Ard Tiarna" or Ard Ri in earlier times. Finally, there were the lords of lesser areas (Tiarna), who owed fuedal rent and allegience to the Ard Tiarna closest or sometimes to the King. Below the Kings, were the Knights, some famous bands like the Fianna, Red Branch etc. are written about. These were the mounted Warriors. So the magic number 3 is there again, the Royals, the persons with land, and the warriors all had an honour of being this by birth, as usually one followed in their parents footsteps.
The French Celts (which were Anglo-Norman) there was only one King who had complete power over all subjects and did not share with lesser lords. The Nobility here represented earthly power of military might and they allowed actual power over all physical possessions and control of territory.
For some famous British tribal nobles names from early periods, I found a well written blog. Just push on the link here.
Freeman or Craftsman Class,
Two classes at the very bottom; The Non-Free - servants and; the criminals.
Also included in nobility are the three types of Druids, the Druid, the Bard and the Ovate. It is not clear but it seems that each of these were divided by three as well.
Bard (British) - In Ireland they are called the Fili and the top, like the King, is called the Ard Fili. This role was taken by one who was versed in all three areas of Bardic training in their schools. All Bards were at different levels, but the Ollamh (kind of like a professor degree) was what you were called once you finished after 6 - 7 yrs.., and decided on your specialty The first type is the poet-musician and story teller. A very powerful type. The second type of Bard was called the Seanacha, in Ireland and these were the Historians and geneaologists. Their top of course is called the Ard Seanacha. And the third type were the ones going on to Druid level called the Brehons. They were judges, who would hear grievances and arbitrate disputes. Kings and Queens did not have any more privilege as to the judgements given to them as would any commoner or freeman, but the Druid classes were. They are all above the King and/or Queen, especially in terms of hospitality and treatment. Every law in specific detail about hospitality. No one could harm one, even on the battle field. In Ireland, these occupations did not every carry a weapon and were always peacemakers. The Bards were the ones mostly on the battle field as they had to record what went down and give credit where credit was do and insult as well.