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How Far Back Can You Go With Genealogy?

If you’ve been into genealogy or genetic genealogy for a while, you’ve probably heard someone say that they have traced their ancestry back to William the Conqueror (d. 1087), Julius Caesar (d. 44 BC), or even Adam and Eve.  While it can be easy to poke fun at these people, it can lead us to wonder how far back you can really go with genealogy?  And how far back would we really want to go?

In this post, I’ll discuss the following related topics:

  • How far back is it possible to go in genealogy
  • Can DNA help you go back further in history than traditional genealogy?
  • Some people who we believe to be our ancestors aren’t really related to us
How Far Back Can You Go With Genealogy_

Most of us genealogists strive to make sure that our research is accurate, and accuracy is one reasons that many people who are interested in family tree research decide to take DNA tests.  Whether or not you think accuracy really matters, it is interesting to ponder how far back you can realistically (and accurately) build a family tree.

How far back is it possible to go in genealogy?

How far back can we actually build our family tree?  While we can build our family trees back as far as we want to, what we really want to know is how far back can we accurately build our family trees? 

The answer to this question is a concise “it depends”.

How far back we can really build our trees back depends on many factors including their religion, race, social class, place of birth, culture, and luck.  In order to build our trees, we need documentation and evidence, and whether or not said documentation and evidence exists depends on some of those factors I just mentioned.

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It takes luck to build a family tree really far back

In order to get evidence for our trees, we need luck.  Bad luck is what I would call the 1890 census records being destroyed in a fire or church records being burned in a vengeful conflict. 

Good luck is finding a full-page newspaper article detailing our great-great-great grandfather’s life and death.  Our ancestors needed to be lucky enough to have the socioeconomic resources to have records created about them, and we need to be lucky enough to find those records. 

The records themselves also need to be “lucky” to survive centuries without being damaged.

Family tree records depend (a lot) on religion

Each religion has different customs of record keeping, and sometimes those customs vary by country or culture.  Sometimes, religious organizations were the only institutions keeping records in a particular area in a given time period, and so religious records would only pertain to those people who practiced that religion.

The wealth or fame of our ancestors affects whether we can learn about them

Even though written records of events like births and deaths of “regular people” have been kept in some places since about the year, not every birth and death was recorded in places where records were kept. 

The race, social class, or socioeconomic status of a person had a lot to do with whether or not important events in their lives were recorded in an official manner, or whether society in general felt that it was important to document noteworthy aspects of their lives. 

An extreme example?  If our 10th great-grandfather was the King of England, we are more likely to find out lots of details about his life than we would if he were the servant cleaning the king’s bedchambers.

Modern record-keeping and use of surnames helps track ancestors

Some of our ancestors might have been born in places were no records were kept.  Others might have been born in places where no surnames were used until just a few hundred years ago.

How far back can the average person trace their family tree

As you can see, how far we can accurately build our tree back really does depend on a lot of different factors.

Most people will be able to trace some lines of their family tree back to the 1600s.  Some people might be able to trace a few lines of their tree back a little further than that, especially if they have a very notable person in their family tree that has had a lot of independent research done about them. 

This means that some people might be able to trace some aspects of their tree back to as far as about 1400, which would be considered unusual.  Most serious genealogists would view a tree that goes back to the year 1400 with a large dose of skepticism.

There are some exceptions to this generalization, however.  For example, the Icelandic culture is famous for its detailed genealogies. 

It is said that “everyone” in Iceland knows their genealogy, and that some are able to trace their ancestry back as many as 30 generations.

Can DNA help you go back further than traditional genealogy?

DNA testing is excellent for assisting in breaking down brick walls in your tree closer than about 6-8 generations ago, but it won’t be much help in figuring out who your 11th great-grandmother’s biological father really was. 

I like to suggest that DNA testing can help us absolutely verify our recent ancestry and can help us feel fairly sure about our ancestry going back about 6-8 generations.

Even though DNA testing can’t help us go further back in our family tree than traditional genealogy can, it does help build our tree’s foundation.  I would hate to spend years researching my family tree only to later find out that I had the wrong great-great-great grandfather in one line of my tree. 

Once I am sure about all of my recent ancestors, I can spend time building my tree farther back and feel more confident about its accuracy.

Some of our ancestors aren’t really related to us

One important aspect of accuracy in a family tree is the occurrence of “non-paternity events“.  Every once in a while, a father unknowingly (or sometimes knowingly, but it isn’t recorded anywhere) raises a child who is not biologically related to him. 

This is rare, but does occur in about 1 out of 100 births, on average.  It happens more in some cultures than others, and has been more common in certain time periods than others.

This means that if you consider that we have about 1000 8th great-grandparents, meaning that there were about 500 marriages that took place among that generation of your ancestors.  This could mean that as many of five of your great-great-great-great-great-great-great grandparents have the “wrong” father listed on their birth record or church record.

While I can’t tell you whether or not this really happened in your family, I can tell you that it’s very likely that it happened at least once at some point.  How often it happened would depend on your family’s history. 

While DNA testing can help sort some of this out, we can safely assume that everyone who has a large family tree has a “wrong” person (or several) in their tree somewhere.

How far back can you go with genealogy, image for pinterest with a dinosaur on it


I hope that this post answered your question about how far it is possible to go back in a family tree.  I would love to know how far back your family tree goes, or if you agree or disagree with my assessment of how far back it’s really possible to build a tree. 

Please leave a comment in the discussion below 🙂

Thanks for stopping by!

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Tuesday 19th of January 2021

I have a notable family that includes numerous people of great historical importance across multiple branches, speaking only to those that are my direct ancestors for this conversation. Many of my direct ancestors, being people of note during their contemporary era, their lives were very well documented in numerous accredited sources so I have a very extensive and well established family lineage that I can name one but usually both of my biological parents, grandparents, great grandparents and so on back to about 430ad/ce. That is about 45 generations. It’s very helpful when historians have done much of the heavy lifting!

John Russell Ferris

Wednesday 16th of December 2020

My wife Mary Cecilia FLYNN has two uncles who were in the second world war and killed in Egypt other in Italy. I would like to know the web sight number or name to search for this information. Thank you ever so much. John Ferris


Thursday 17th of December 2020

Since you do not list your country, this is a site for searching US Army members and the that list includes 2,000 FLYNN members. Try the National Archives site -


Thursday 10th of December 2020

I first tag each of my cousin matches as paternal or maternal and then by grandparent branch or due to a common ancestor. I had read that some connections could be 15 to 20 generations back. My DNA and maternal family Y-DNA is related to some of the peerage of England of which there seems to be more records. As I type in the surnames of each generation to search for matches, I am coming up with several matches to my maternal Ingram family back to 1524 in Staffordshire, England to my 14th great grandparents. The more peerage names I search with, I come up with a connection to several Ingram cousins. The connection to the peerage branch I have traced back to 1490 in Yorkshire, England and the Viscounts of Irwin but it seems will be back further than that. My distant Ancestry 5th - 8th cousin's tree is the one back to 1490. I am also finding I have Cawood cousins on my paternal side matching with Ingram on my maternal side. The Cawood's were from Yorkshire, England before 1500. Am I the lucky one to form a correct tree and my DNA searches match with cousins of the same surnames and I'm now researching my 1500's and earlier families? Thanks.


Saturday 14th of November 2020

How far back can the average African-American trace their ancestry? My family tree goes back to around 1830.

Theresa Theresa

Friday 30th of October 2020

Can death certificates help track down ancestors?


Thursday 17th of December 2020

Yes, but only if the informant knew the correct name of the father and the correct maiden name of the mother. Remember, the person that may know the truth was not alive to give those answers. Order them at your own risk. Some will be right and some wrong. Some will list parents and their birth sites and some may be blank. Those with names and birth states or countries may give you more names to research or pinpoint a city, state, or country.


Friday 30th of October 2020

Hi Theresa, You ask such a good question. Yes, death certificates are very useful documents for genealogy. You can often find the names of the parents of the deceased written on the death certificate, as well as place and date of birth. They are an excellent resource. Thank you for your comment! Mercedes

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