The Mirandese language reference article from the English Wikipedia on 24-Apr-2004
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Mirandese language

Mirandese (mirandese: Mirandés) is a language spoken in northeast Portugal, which was recognised by the Portuguese Parliament in 1999.

It is a dialect of the ancient Leonese language of northern Spain, which today is considered a part of the Asturian language, which in its turn is considered by many a dialect of Spanish.

However, these amalgamations in the Spanish territory did not affect Mirandese, which is a distinct language in relation to both Portuguese and Spanish. It is the last remnant of the ancient language of the Kingdom of León.