The Treaty of Hanover was developed in response to the Treaty of Vienna (June 7, 1725) in which King Philip V of Spain allied himself with Habsburg Austria after his daughter's engagement to Louis XV of France was broken off. This accord was concluded by Great Britain, France and Prussia on September 3, 1725. George I, growing concerned about a potential conflict with Spain, signed the agreement linking France, Prussia, and the Netherlands (later acceded) together in opposition to Spain.