The first sighting by Europeans of Ninigo islands was by the Spanish navigator Iñigo Órtiz de Retes on 27 July 1545 when on board of the carrack San Juan tried to return from Tidore to New Spain. He charted them as La Barbada (the bearded island in Spanish).
- The Wuvulu Web Site - Geographical Names in the Western Islands
- Coello, Francisco "Conflicto hispano-alemán" Boletín de Sociedad Geográfica de Madrid, t.XIX. 2º semestre 1885, Madrid, p.317.
- Sharp, Andrew The discovery of the Pacific Islands Clarendon Press, Oxford, 1960, p.31.
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