Ferdinand I of Portugal
Count of Viana (da Foz do Lima) (in Portuguese "Conde de Viana (da Foz do Lima)") was a Portuguese title of nobility granted to Álvaro Pires de Castro, brother of Inês de Castro, granted by King Ferdinand I of Portugal on June 1, 1371. D. Álvaro was already 1st. Count of Arraiolos and 1st. Constable of Portugal.