The collection started by Pedro I would be expanded by his son, emperor Pedro II, an amateur Egyptologist and notable collector of archaeological and ethnographic artifacts. One of the most important additions to the Egyptian collection of the National Museum made by Pedro II is the polychromed wood sarcophagus of the singer of Amun, Sha-Amun-en-su, from the Late Period, offered to the emperor as a gift during his second trip to Egypt, in 1876, by the Khedive Ismail Pasha. The sarcophagus is distinguished for its rarity, since it is one of few examples that have never been opened, still preserving the mummy of the singer in its interior. The collection would be enriched through other acquisitions and donations, becoming, at the beginning of the 20th-century, sufficiently relevant to draw the attention of international researchers and Egyptologists, such as Alberto Childe, who served as conservator of the Department of Archaeology of the museum between 1912 and 1938 and was also responsible for publishing the "Guide of the Collections of Classical Archaeology of the National Museum", in 1919.