Ferdinand III (Spanish: Fernando; 1199/1201 30 May 1252), called the Saint (el Santo), was King of Castile from 1217 and King of Len from 1230 as well as King of Galicia from 1231. He was the son of Alfonso IX of Len and Berenguela of Castile. Through his second marriage he was also Count of Aumale. Ferdinand III was one of the most successful kings of Castile, securing not only the permanent union of the crowns of Castile and Len, but also masterminding the most expansive southward territorial expansion campaign yet in the Guadalquivir Valley, in which Islamic rule was in disarray in the wake of the decline of the Almohad presence in the Iberian Peninsula.

By military and diplomatic efforts, Ferdinand greatly expanded the dominions of Castile by annexing the Guadalquivir river valley in the south of the Iberian Peninsula, establishing the boundaries of the Castilian state for the next two centuries. New territories included important cities such as Baeza, beda, Jan, Crdoba or Seville, that were subject of Repartimiento, given a new general charter and repopulated in the following years.

Ferdinand was canonized in 1671 by Pope Clement X. Places such as the cities of San Fernando, Pampanga and San Fernando, La Union; the Diocese of Ilagan and the San Fernando de Dilao Church in Paco, Manila in the Philippines; and in the United States, in California the City of San Fernando, the San Fernando Valley, and in Texas the Cathedral of San Fernando in San Antonio were all named after him.

Seville (; Spanish: Sevilla, pronounced [seˈβiʎa] (listen)) is the capital and largest city of the Spanish autonomous community of Andalusia and the province of Seville. It is situated on the lower reaches of the River Guadalquivir, in the southwest of the Iberian Peninsula.

Seville has a municipal population of about 685,000 as of 2021, and a metropolitan population of about 1.5 million, making it the largest city in Andalusia, the fourth-largest city in Spain and the 26th most populous municipality in the European Union. Its old town, with an area of 4 square kilometres (2 sq mi), contains three UNESCO World Heritage Sites: the Alcázar palace complex, the Cathedral and the General Archive of the Indies. The Seville harbour, located about 80 kilometres (50 miles) from the Atlantic Ocean, is the only river port in Spain. Seville experiences high temperatures in the summer, with daily maximums routinely above 35 °C (95 °F) in July and August.

Seville was founded as the Roman city of Hispalis. Known as Ishbiliyah after the Islamic conquest in 711, Seville became the centre of the independent Taifa of Seville following the collapse of the Caliphate of Córdoba in the early 11th century; later it was ruled by Almoravids and Almohads until being incorporated to the Crown of Castile in 1248. Owing to its role as gateway of the Spanish Empire's trans-atlantic trade, managed from the Casa de Contratación, Seville became one of largest cities in Western Europe in the 16th century. Coinciding with the Baroque period, the 17th century in Seville represented the most brilliant flowering of the city's culture; then began a gradual economic and demographic decline as silting in the Guadalquivir forced the trade monopoly to relocate to the nearby port of Cádiz.

The 20th century in Seville saw the tribulations of the Spanish Civil War, decisive cultural milestones such as the Ibero-American Exposition of 1929 and Expo '92, and the city's election as the capital of the Autonomous Community of Andalusia.