Hi Jason,
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Good to hear you have your results through. You can find out more about your haplogroup on Discover:
though do be a little critical of the GlobeTrekker output for now - it is still often quite far from the truth.
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Your "terminal" haplogroup, R-FT368395, is between about 1000 and 2000 years old, but probably somewhere in the middle. We can't be more precise than that until we get more data.
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The bad news is that this means that no-one has taken a BigY test who is more closely related to you than that. If that were the case, we would have probably expected to see them on your Y-111 matches anyway. However, we can expect to eventually find new people who are closer to you and provide more accurate dates as time progresses and more people test.
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Your family is held in high esteem in our little world. Of the handful of tested people within your haplogroup, one is James Watson, one of the discoverers of the DNA double helix. You share a relationship at the age of R-FT368395, so somewhere between 1000 and 2000 years ago - that makes him a distant cousin, but very few people can claim such a close relationship!
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You also share an ancestry from somewhere between 1800 and 2600 years ago with an ancient burial, Cherry Hinton 923, from Cambridgeshire. This is via the older and larger haplogroup R-FGC51269.
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From this slightly larger haplogroup, we can start thinking about ancestral origins. This is a very difficult topic to be precise about and it's fraught with difficulty. A big part of this is because of the biases we have in testing. We can begin with the facts. Within the British Isles, the majority of R-FGC51269 appears to be English. However, there may be large continental populations of the haplogroup that are hidden due to lack of testing. You do have one German in this haplogroup.
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Now the speculation. The combination of a German match, a predominantly English distribution within the UK/Ireland and a haplogroup structure with many of its branches splitting within the period 200-600 AD (indicative of when the population growth happened) makes me think that your ancestors were part of the Germanic communities who migrated to Britain during the Dark Ages: we used to call them "Anglo-Saxons", but the cultural net was probably rather wider than this. This assessment is very much an educated guess, so you should be clear not to treat it as either fact or even a probable conclusion, simply the possibility I think most likely.
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Best wishes,
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Iain.
