Ivor Prime was the formerly inhabited prime planet in the Ivor system. This was the site of a Federation colony.
In 2373, the colony was destroyed by a Borg cube en route to Earth, as part of another attempt at an invasion of the Federation. (Star Trek: First Contact)
According to the Star Trek: Star Charts ("United Federation of Planets I"), Ivor Prime was listed as a member planet of the Federation in 2378.
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