The red grape variety originates from Portugal. Synonyms are Arruya, Casculo, Castellao, Moreto, Moreto d'Alenteijo, Moreto d'Alentejo, Moretto, Morito, Murete, Mureto, Mureto do Alentejo, Portugieser Veste di Monica Arnya and Tinta de Alter.

According to DNA analyses carried out in 2013, this is a presumably natural cross between Jaén Blanco (Cayetana Blanca) x Alfrocheiro. However, this is based on only 20 DNA markers (see molecular genetics). It should not be confused with the varieties Baga, Blauer Portugieser and Moreto do Dão due to partly identical synonyms and morphological similarities.
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