"Gilbertus Anglicus: Medicine of the Thirteenth Century" by Henry E. Handerson is a historical account written in the early 20th century. The work focuses on the contributions of Gilbertus Anglicus, a notable 13th-century physician, emphasizing his treatise known as the "Compendium Medicinae." It highlights the medical practices, theories, and the overall state of medicine during that era, offering insights into how historical medical wisdom has shaped contemporary understandings. The opening of this work introduces the premise of studying the life and contributions of Gilbertus Anglicus in the context of his era. It begins with the acknowledgment of Handerson's manuscript, which was posthumously published, reflecting on the author's scholarly pursuits and his dedication to the field of medical history. Handerson provides a brief biography of Gilbert, exposing the gaps in historical records about his life while outlining his significant influence on medieval medicine. The narrative signals that the subsequent sections will delve into Gilbert's medical theories, treatments of diseases, and the literary legacy of his work, positioning him as a critical figure in the history of English medicine. (This is an automatically generated summary.)