Historical...

Source: http://www.ourcuriousworld.com/TypesofGhosts.htm

The second type of interactive personality is the historical, which is roughly defined as the manifestation of a person not personally known to the witness, but who is still identifiable as a known deceased individual. The ghost of Abraham Lincoln is probably the most famous example of a historical, though of course, one needn't be famous to be 'historical;' simply being a past owner of a now haunted residence can make one a 'historical' personality. All that is required is that the person be identifiable, even if their identity is not determined until after the viewing. Unlike familials, historicals are among the more long-term manifestations seen, often residing within a particular locale for years or even decades, and are seen by countless scores of witnesses over a considerable period of time. As such, they also make the best 'test ghosts' because of their longevity and, to some degree, predictability.

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Source: http://www.ourcuriousworld.com/TypesofGhosts.htm