What is the highest rank of the british peerage?

Answer 1

Baron

It should be noted also that:

In Scotland, a Baron is called a Lord of Parliament

There are five categories of British peerage and they have a hierarchy themselves:

1. Peerage of England

2. Peerage of Scotland

3. Peerage of Ireland

4. Peerage of Great Britain

5. Peerage of United Kingdom

Also peerages are ranked based on creation date.

Therefore a Baron of the United Kingdom is a lower grade than a Baron of England, and the lower of two Baronies of the United Kingdom would be the one created most recently.

Hope that edit helps!

TomPC

Answer 2

I believe the highest rank (not the oldest) is the title of Duke.