said, from the said
Arctic pole to the said Antarctic pole. And when this line has been
determined as above said, those sent by each of the aforesaid parties,
to whom each one of the said parties must delegate his own authority
and power, to determine the said mark and bound, shall draw up a
writing concerning it and affix thereto their signatures. And when
determined by the mutual consent of all of them, this line shall be
considered forever as a perpetual mark and bound, in such wise that
the said parties, or either of them, or their future successors,
shall be unable to deny it, or erase or remove it, at any time or in
any manner whatsoever. And should, perchance, the said line and bound
from pole to pole, as aforesaid, intersect any island or mainland,
at the first point of such intersection of such island or mainland
by the said line, some kind of mark or tower shall be erected, and
a succession of similar marks shall be erected in a straight line
from such mark or tower, in a line identical with the above-mentioned
bound. These marks shall separate those portions of such land belonging
to each one of the said parties; and the subjects of the said parties
shall not dare, on either side, to enter the territory of the other,
by crossing the said mark or bound in such island or mainland.

_Yten_: Inasmuch as the said ships of the said King and Queen of
Castilla, Leon, Aragon, etc., sailing as before declared, from their
kingdoms and seigniories to their said possessions on the other
side of the said line, must cross the seas on this side of the line,
pertaining to the said King of Portugal, it is therefore concerted and
agreed that the said ships of the said King and Queen of Castilla,
Leon, Aragon, etc., shall, at any time and without any hindrance,
sail in either direction, freely, securely, and peacefully, over the
said seas of the said King of Portugal, and within the said line. And
whenever their Highnesses and their successors wish to do so, and
deem it expedient, their said ships may take their courses and routes
direct from their kingdoms to any region within their line and bound
to which they desire to despatch expeditions of discovery, conquest,
and trade. They shall take their courses direct to the desired region
and for any purpose desired therein, and shall not leave their course,
unless compelled to do so by contrary weather. They shall do this
provided that, before crossing the said line, they shall not