Libra

Libra was a virtual representation of one of Arno Dorian's genetic memories, relived by a Helix initiate through the Helix Navigator.

Description
Arno solved several riddles to find a part of the Nostradamus Disc.

First riddle
Palace once divided, united by the fourth Henry. Stone Couples salute their doomed King For his final walk along the trees, King once united, divided by People's will.

Second riddle
Last Ray from the Sun He lost a son and parted from another. Cobblers, soldiers, statesmen and whoresons, Cheer the window's close, blotting out the sun.

Third riddle
The Magdalen looks towards Death And watches the precession, unblinking, And thus unmoved, she keeps her back Toward the interment of her King.

Outcome
Arno retrieved one of the fragments of the Nostradamus Disc.

Reference

 * Assassin's Creed: Unity