Template:Wp-Infante Fernando, Lord of Eça

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Ferdinand of Portugal, later of Eça or Eza ( – Eza?), was the son of Portuguese Infant João, Duke of Valencia de Campos. João, was a son of king Peter I of Portugal with powerful and literary famous for several centuries in several European languages, Galician lady Inés de Castro, "the Queen who ruled after her death".

His father, Infante John, Duke of Valencia de Campos, (Coimbra 1349-Salamanca 1397), buried there, had been legitimized as Infant of Portugal, and became Duque de Valencia de Campos in Castile through his marriage to one of the bastards of bastard king Henry II of Castile. Fernando's father John, had married in 1376, (1st marriage), Castilian lady Maria Téllez de Menezes, assassinated shortly after in 1378 by her husband, who had been alerted of her apparent unfaithfulness.

Then, he married again in Valencia de Campos in 1378 Constanza de Castilla, Lady of Valencia de Campos, illegitimate daughter of bastard King Enrique II of Castile, who was therefore the step mother of orphaned Fernando of Portugal, thus becoming consort duke of Valencia de Campos.