Earliest Known Ancestor (EKA)

The Earliest Known Ancestor (or EKA for short) represents the farthest back in generation (and often time) ancestor known along a particular line.  It is the EKA that often defines a family branch and used as a stake in the ground from which to study before and after.  Specifically, following forward in time the chain of ancestors to find cousins. And casting a wider net of search backward in time to find the ancestors of the EKA.

In this study project, patrilineal lines are most often identified by the EKA ancestor that likely represented the modal marker values uncovered by DNA testing of current ancestors. Occassionaly, a line is identified by a more famous descendant or an earlier EKA.  The line then will mention the currently discovered EKA in addition to the person used to identify the line.  When lines are merged through advancement of study, previous EKA may still be mentioned as important names for genealogical study purposes. 

See also the related Most Recent Common Ancestor (MRCA).