The History of Parliament. British political, social and local history.
This is a brilliant source if you are doing research on a historical person. This person must have been an MP, of course.
The years 1790-1820 feature 2,143 21,000 biographies. Besides the vita the data includes family background and offices held.
The History of Parliament is a research project creating a comprehensive account of parliamentary politics in England, today covering ten periods and 21,000 biographies. This is a website to get lost in.
I used this source to write – for example – my post “Writer’s Travel Guide: Lyme Park – an Austen Drama in its Own Right.“