BARRIER TREATY, the name given first to the treaty signed on Oct. 29, 1709, between Great Britain and the states general of the United Netherlands, by which the latter engaged to guarantee the Protestant succession in England in favour of the house of Hanover; while Great Britain undertook to procure for the Dutch an adequate barrier on the side of the Netherlands, consisting of a number of fortified towns, together with the cita del of Ghent. (Cf. the Treaty of Ryswick, 1697, q.v.) A second Barrier treaty was signed between Great Britain and Holland on Jan. 29, 1713, the terms of which were included in the Treaty of Rastatt, between the emperor and France, signed on March 7, 1714. A third Barrier treaty was signed in Nov. 1 715.