FERDINAND I. (1345-1383), king of Portugal, sometimes referred to as el Genii! (the Gentleman), son of Pedro I. of Portugal, was born on Oct. 31, 1345, at Coimbra and succeeded his father in 1367. On the death of Pedro of Castile in 1369, Ferdinand, as great-grandson of Sancho IV. by the female line, became one of the claimants for the throne of Castile (see SPAIN: History), thus involving himself in disastrous wars between 13 7 o and 1382, when peace was made at Badajoz, it being stipulated that Beatrix, the heiress of Ferdinand, should marry King John of Castile, and thus secure the ultimate union of the crowns. Ferdi nand left no male issue when he died at Lisbon on Oct. 22, 1383, and the direct Burgundian line, which had been in possession of the throne since Count Henry (about 1112), became extinct.