§ Ms Quin
The agreement signed in 1713 and known as the Treaty of Utrecht was part of a series of treaties which ended the War of the Spanish Succession. The full Treaty contained provisions relating to a wide range of areas and issues, many of which are no longer applicable.
British title to the Rock of Gibraltar is based on Article X of the Treaty. In determining title to the Rock, this remains binding under international law upon the two parties, the UK and Spain. Both parties have so conducted themselves for many years.