A focused population profile of Castilians from Castile and Leon, their northwestern Iberian background, closest modern genetic matches, ancestry model, and World Genetics G25 heatmap.
Castilians from Castile and Leon come from a large northwestern Spanish region including provinces such as Leon, Burgos, Valladolid, Salamanca, Zamora, Palencia, Segovia, Soria, and Avila. The region is central to medieval Castile, the Leonese kingdom, the Reconquista frontier, rural Meseta communities, and the development of the Spanish language.
Spanish, historically Castilian, is the main language. Leonese and other regional speech traditions are part of the broader historical landscape, especially in the west of the region.
As a genetic reference, Spanish Castile and Leon Castilian is useful for comparison with Galician, Portuguese, Andalusian, Extremaduran, Castilla-La Mancha, Murcian, Valencian Alicante, Azorean Portuguese, and other western Iberian references.
In the World Genetics modern G25 comparison, the closest non-self match for Spanish Castile and León (Castilian) is Spanish Galicia (Galician). Other nearby references include Portuguese, Spanish Andalusia (Andalusian), Hispano-Cuban, and Hispano-Puerto Rican. This gives the Spanish Castile and León (Castilian) profile its nearest modern genetic context inside the current reference database.
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The ancestry breakdown gives deeper component proportions, while closest matches show modern similarity. Castile and Leon is best interpreted as a western/northwestern Iberian Castilian profile, with Galician, Portuguese, Andalusian, Extremaduran, and nearby Castilian references.
The heatmap should emphasize Castile and Leon, Galicia, Portugal, Extremadura, Castilla-La Mancha, Andalusia, Murcia, Valencia, and the western Iberian Peninsula.
The closest non-self match in this World Genetics comparison is Spanish Galicia (Galician). Other nearby references include Portuguese, Spanish Andalusia (Andalusian), Hispano-Cuban, and Hispano-Puerto Rican.
In the current modern G25 reference set, Spanish Galicia (Galician) is the closest listed match to the Spanish Castile and León (Castilian) average after removing Spanish Castile and León (Castilian) itself from the table.
The heatmap shows where modern reference populations are closer or farther from the Spanish Castile and León (Castilian) G25 average, giving the closest-match results a geographic view.
