Here are some of his most notable writings:
* "Ethiopia Oriental" (1590): This is his most famous work, a detailed account of the geography, history, culture, and people of Ethiopia. It contains valuable information about the social, political, and religious conditions of the region, including the Ethiopian Orthodox Church and the presence of the Portuguese.
* "Livro das Peregrinações de Tomé Lopes" (1590): A travel journal of Tomé Lopes, a Portuguese merchant, that details his journey to the East Indies, covering his experiences and observations.
* "The History of the Missions in the East Indies" (1562): A historical account of the Jesuit missions in the East Indies, detailing the challenges and successes of their work in converting the local populations to Christianity.
* Other works: Dos Santos also wrote several other works, including "The Life of St. Francis Xavier" (1564), which is a biographical account of the famous Jesuit missionary.
It's important to note that while his works are valuable for understanding the history of the East Indies, they are also products of his own time and worldview, and should be interpreted with caution.
His writings, however, provide a unique insight into the cultural and religious encounters between Europeans and Asian societies during the early modern period.