I have the photo above from a family album showing Sir Maurice Fitzgerald, one of the Knights of Kerry in Ireland (FitzGerald-965). I would like to verify if the man pictured is the 18th Knight of Kerry (1772-1849) or the 20th Knight of Kerry (1844-1916). They were both called Maurice Fitzgerald. Perhaps there are clues in the decor, clothes, furniture in the photo that could help narrow down which decade the photo was taken? Thank you for your help.
What is the photo printed on? That would be a clue. The earliest photos of people were made in 1838, and were printed on metal, ie, Daguerrotypes. These were common in the 1840s and 1850s. These were also usually in ornate cases, and not in albums. If it is in an album, the photo is of a later period. This suggests to me that the photo of the later Sir Maurice. Edit ... second thoughts ... I searched for images of Sir Maurice, and a couple come up that look very different from the man in this photo. Much more distinguished looking. So, my “logic” seems somewhat weak.
See https://www.maritimeviews.co.uk/byy-biographies/fitzgerald-sir-maurice-bart/
The Public Record Office of Northern Ireland (PRONI) is the official archive for Northern Ireland. They have much information on the Knights of Kerry. You can easily contact them and have your query answered, and/ or be put in touch with a scholar who will assist you. I spent time there a few years ago. They have amazing collections and archives.
https://www.nidirect.gov.uk/proni
They have an enquiry service:
https://www.nidirect.gov.uk/articles/proni-enquiry-service
Good luck with your research
Does this look like the man's hat??
AN EARLY 19TH-CENTURY SAILOR`S FOUL WEATHER HAT constructed from tarred leather with stitched brim
https://www.the-saleroom.com/en-gb/auction-catalogues/charles-miller-ltd/catalogue-id-srcharl10001/lot-4286f62e-f077-4ad0-82f3-a42700fe591e