Apollo 11
In 1969, the Apollo 11 Moon Landing was a Templar plot to recover a Piece of Eden, the Fifth Apple, which was located on the Moon.
With the mission being a success, the astronauts returned and the Piece of Eden came into the possession of Abstergo Industries, though it was never shown to the public. Information about the event was later discovered by Clay Kaczmarek after he had hacked Abstergo's files, during his time as Animus Subject 16.
He later placed the uncovered information onto the Animus' memory core which was implanted into the Animus 2.0, as the fifth cluster puzzle that Desmond Miles would later find during his time in the Animus as Ezio Auditore da Firenze, at the Hideout alongside Lucy Stillman, Shaun Hastings and Rebecca Crane.[1]