Anglo-Spanish Convention (1817)

Anglo-Spanish Convention (1817)
Name	Anglo-Spanish Convention (1817)
Date signed	1817
Location	London
Parties	United Kingdom; Spain
Context	Post-Napoleonic diplomacy; Atlantic suppression of slave trade; colonial unrest

Anglo-Spanish Convention (1817) was a bilateral agreement between the United Kingdom and the Kingdom of Spain aimed at suppressing the transatlantic slave trade and regulating naval cooperation in Atlantic waters after the Napoleonic Wars. Concluded in London during the tenure of Lord Castlereagh and Mariano Luis de Urquijo-era Spanish diplomacy, the convention reflected pressures from the Congress of Vienna, the Royal Navy's anti-slavery patrols, and Spanish concerns about maintaining authority in the Spanish American wars of independence.

Background

In the aftermath of the Battle of Waterloo and the diplomatic settlements at the Congress of Vienna, European powers sought to reorder maritime rules embodied in instruments such as the Anglo-Portuguese Treaty (1815). The United Kingdom had abolished the Slave Trade Act 1807 and expanded the West Africa Squadron to enforce abolition, while Spain, under the reign of Ferdinand VII of Spain, faced insurgencies in New Spain, Viceroyalty of Peru, and the Viceroyalty of the Río de la Plata. British pressure combined humanitarian advocacy from figures tied to the Society for the Mitigation and Gradual Abolition of Slavery Throughout the British Dominions and strategic interests related to rivalry with France and the United States in the Caribbean Sea. Prior treaties like the Treaty of Paris (1814) and agreements with the Kingdom of Portugal framed expectations for reciprocal naval rights and mixed commission courts exemplified later by the Anglo-Portuguese Treaty (1815) and the Franco-British agreements on maritime suppression.

Negotiation and Signing

Negotiations were conducted by British diplomats including Viscount Castlereagh and Spanish plenipotentiaries drawn from the Madrid court under ministers allied to Ferdinand VII. Talks in London involved representatives from the Foreign Office and naval officers from the Royal Navy such as commanders of the West Africa Squadron seeking legal authority to stop and search Spanish vessels. Spain's negotiators referenced precedents from the Treaty of Amiens and sought protections for sovereignty over colonial shipping linked to ports like Havana and Puerto Rico. The resulting text was signed in 1817 and reflected compromise between British insistence on right of search and Spanish insistence on territorial jurisdiction as seen in earlier treaties like the Treaty of Utrecht and arrangements reached at the Congress of Aix-la-Chapelle.

Terms of the Convention

The convention established provisions for mutual assistance in suppressing the Atlantic slave trade, including authorizations for naval interception modeled on clauses from the Anglo-French Convention (1814) and later expanded in the Anglo-Portuguese Treaty (1810). It specified procedures for the visit and search of ships suspected of trafficking enslaved Africans, rules for adjudication by mixed commissions analogous to those created under the Treaty of Ghent framework, and stipulations concerning the treatment of liberated Africans similar to practices in Sierra Leone and Freetown. The text balanced Spanish prerogatives over colonial maritime traffic from ports such as Cádiz and Seville with British enforcement expectations drawn from experiences in the Gulf of Guinea and the Caribbean Sea.

Implementation and Enforcement

Implementation relied on deployment of Royal Navy squadrons and coordination with Spanish naval units based in arsenals like Cartagena and Cádiz. British captains operating under orders from the Admiralty conducted stops and seizures, bringing cases before prize courts and mixed tribunals in colonial seats including La Guaira and Havana when permitted. Enforcement encountered limits due to Spain's commitment to the Slave Code remnants and the logistical challenges of patrolling the Atlantic Ocean against slavers operating from the Gold Coast and the Bight of Biafra. Diplomatic disputes arose when British searches collided with Spanish claims invoking the Law of Nations and precedents from the Treaty of Utrecht, leading to arbitration practices influenced by jurists connected to institutions like the British Admiralty Court.

Diplomatic and Colonial Impact

The convention influenced British-Spanish relations amid the decline of imperial control over Spanish America, affecting diplomatic positions regarding insurgent leaders such as Simón Bolívar, José de San Martín, and colonial assemblies in Caracas and Buenos Aires. It contributed to the gradual international delegitimization of the transatlantic slave trade, aligning with initiatives seen at the International African Association and later conventions like the Brussels Conference (1890). The agreement also factored into Anglo-Spanish disputes over territorial claims in the Caribbean, interactions with Cuba and Puerto Rico, and commercial implications for merchant ports including Liverpool, Bristol, and Cadiz.

Legacy and Historical Assessment

Historians evaluate the convention within broader narratives of abolitionism, imperial realpolitik, and the collapse of the Spanish Empire in the Americas. Scholars link it to British maritime legal innovations exemplified by the Suppression of the Slave Trade Act 1824 and to diplomatic continuities observed in later accords such as the Anglo-Spanish Convention of 1899 on territories. Critiques emphasize its incomplete enforcement and the persistence of clandestine trafficking into the mid-19th century despite naval patrols from the West Africa Squadron and judicial rulings by mixed commissions. The convention remains a point of reference in studies of 19th-century international law, diplomatic history of London, and the transatlantic campaigns against slavery led by figures connected to the Abolitionist Movement and maritime institutions like the Admiralty.

Category:Treaties of the United Kingdom Category:Treaties of Spain Category:1817 treaties