The movement and
advance of the rooks, which are the king’s deputies, is such that
the right rook is black and the left rook is white. When the chess
pieces are set, both nobles and common people are first placed in
their proper positions. The rooks, by their own power, have no way
to move unless moved by the nobles or common people, for they are
enclosed in their proper spaces. And the reason is this: since they
are the king’s deputies, lieutenants, or commissioners, their
authority is of no effect until they move out. And once they have
begun to act in their office—for as long as they remain in the
king’s palace, they may not use or exercise their commission—but
once they move, they may exercise their authority.
And you shall understand that their authority is great, for they
represent the person of the king. Therefore, where the board is
empty, they may run all across it, just as they travel through the
kingdom. They may go on both black and white squares, forwards and
backwards. As far as they can run, they go, provided the board is
empty, whether it be over their enemies or among their own company.
When the rook is in the middle of the board, he may go whichever way
he likes, in four straight lines in every direction. And it is to be
known that he may not go diagonally, but always straight, back and
forth as said above.
Therefore, all the king’s subjects, both good and evil, ought to
recognise that their movement and authority as the king’s deputies
and commissioners should be truly just and upright. You shall
understand that they are to be strong and virtuous in battle, for
only the two rooks may conquer a king, defeat his enemy, take him,
and strip him of his life and his kingdom. This was done when Cyrus,
king of Persia, and Darius, king of the Medes, slew Balthazar and
took his kingdom from him. He was nephew to Evil-Merodach, under
whom this game was founded.