Giustino De Jacobis was an Italian missionary and priest born on January 9, 1800, in Milan, Italy. He is best known for his work in Ethiopia, where he played a significant role in the spread of Christianity during the 19th century. De Jacobis was a member of the Congregation of the Mission, also known as the Vincentians, and he dedicated his life to serving the local communities. In Ethiopia, De Jacobis focused on education and the establishment of churches, helping to strengthen the local Christian community. He learned the Ge'ez language to communicate effectively and translated religious texts. His efforts contributed to the growth of the Ethiopian Catholic Church, and he is remembered for his commitment to interfaith dialogue and cultural respect.