Theory of Portuguese discovery of Australia

The theory of Portuguese discovery of Australia claims that early Portuguese navigators were the first Europeans to sight Australia between 1521 and 1524, well before the arrival of Dutch navigator Willem Janszoon in 1606 on board the Duyfken who is generally considered to be the discoverer. This is based on the following elements:

Precedence of discovery has also been claimed for China,France,Spain,India, and even Phoenicia.

Although Alexander Dalrymple wrote on this topic in 1786, it was R. H. Major, Keeper of Maps at the British Museum, who in 1859 first made significant efforts to prove the Portuguese discovered Australia before the Dutch. A group of mid-16th-century French maps, the Dieppe maps, formed his main evidence. However, there is widespread agreement today that his approach to historical research was flawed and his claims often exaggerated. Writing in an academic journal in 1861, Major announced the discovery of a map by Manuel Godinho de Eredia, claiming it proved a Portuguese discovery of North Western Australia, possibly dated to 1601. In fact, as W.A.R. Richardson points out, this map's origins are from 1630. On finally locating and examining Erédia's writings, Major realised the planned voyage to lands south of Sumba in Indonesia had never taken place. Major published a retraction in 1873, but his reputation was destroyed. Major's interpretation was examined critically by the Portuguese historian Joaquim Pedro de Oliveira Martins, who concluded that neither the patalie regiã on the 1521 world map of Antoine de La Sale nor the Jave la Grande on the Dieppe Maps was evidence of Australia having been discovered by Portuguese visitors in the first quarter of the sixteenth century, but that this feature had found its way on to the maps from descriptions of islands of the Sunda archipelago beyond Java collected from native informants by the Portuguese.

...
Wikipedia