In 1138, Ali ibn Yusuf was defeated by Alfonso VII of León, and in the Battle of Ourique ( 1139 ), by Afonso I of Portugal, who thereby won his crown.

Afonso I was the son of Henry of Burgundy and Theresa of León, the natural daughter of King Alfonso VI of León.

The first-born of this union, Infanta Maria of Portugal, married King Alfonso XI of Castile in 1328, at the same time that Afonso IV's heir, Peter I of Portugal, was promised to another Castilian infanta, Constance of Peñafiel.

There has not been a monarch known as Alphonso or Alfonso I of Spain, the first king of that name of the unified Spain being Alfonso XII of Spain ( 1874 – 1885 ).

Several precursor kingdoms have had an Alfonso I.

* Alfonso I of Asturias ( 739 – 757 ).

* Alfonso I of Aragon and Navarre ( 1104 – 1134 ), known as the Battler

* Alfonso II of Aragon, aka Alfons I, Count of Barcelona, ( 1162 – 1196 ) known as el Cast ( the Chaste ) or el Trobador ( the Troubadour )

Alfonso II ( 759 – 842 ), called the Chaste, was the king of Asturias from 791 to his death, the son of Fruela I and the Basque Munia.

* Infante Juan Carlos Teresa Silvestre Alfonso of Spain ( 1913 – 1993 ), named heir to the throne and Count of Barcelona, whose son is the current King, Juan Carlos I of Spain.

Alfonso I ( 1073 / 1074 – 8 September 1134 ), called the Battler or the Warrior (), was the king of Aragon and Navarre from 1104 until his death in 1134.

Alfonso the Magnanimous KG ( also Alphonso ; ; 1396 – 27 June 1458 ) was the King of Aragon ( as Alfonso V ), Valencia ( as Alfonso III ), Majorca, Sardinia and Corsica ( as Alfonso II ), and Sicily and Count of Barcelona ( as Alfonso IV ) from 1416 and King of Naples ( as Alfonso I ) from 1442 until his death.

* Alfonso I of Aragon-( 1104 – 1134 )

* Alfonso I d ' Este, Duke of Ferrara during the time of the War of the League of Cambrai.

Alfonso I may refer to:

* Alfonso I of Asturias ( 739 – 757 ), called the Catholic ( el Católico ), was the King of Asturias

* Alfonso I of Aragon ( 1104 – 1134 ), known as Alfonso the Battler

* Alfonso II of Asturias-( 791-842 )

Alfonso I ( king from 739-757 ) rallied Galician support when driving the Moorish army out of Galicia and an area of that was to become Leon.

After the campaigns of Alfonso I of Asturias ( 739-757 ) against the Moors, the city was abandoned, being in the largely empty buffer zone between Moors and Christians known at the time as " The Desert of the Duero ", and was part of the Repoblación (" repopulation ") effort carried out a century later during the reign of Ordoño I of Asturias ( 850-866 ).

After the campaigns of Alfonso I of Asturias ( 739-757 ) against the Moors, the city lay an abandoned in the largely empty buffer zone between Moors and Christians known at the time as " The Desert of the Duero " and was part of the " Repoblación " ( repopulation ) effort carried out a century later, during the reign of Ordoño I of Asturias ( 850-866 ).