The islands groups were later invaded and renamed and identified by the Spanish to be the island of Mindoro.[4] This was further proved by Ferdinand Blumentritt in his 1882 book, Versuch einer Ethnographie der Philippinen (An Attempt to the Study of Ethnography of the Philippines) that Ma-i was the Chinese local name of present-day Mindoro.[5] On the other hand, historians claimed that Ma-i was not an island, but all the south of South Sea islands groups and Manila itself,[6] which was known to be an overseas Chinese settlement which was in constant contact with the Chinese mainland as early as the 9th century AD.[7]