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|Alfonso XII]] (1874-1885).

Several precursor kingdoms have had an '''Alfonso I'''. You may be looking for:
*[[Alfonso I of Asturias]] (739-757).
*[[Alfonso I of Aragon]] and Navarre (1104-1134), known as ''the Battler''.
*[[Alfonso II of Aragon|Alfons I, Count of Barcelona]] (1162-1196) known as ''el Cast (the Chaste)'' or ''el Trobador (the Troubadour)'', also Alfonso II of Aragon.

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