Petrus Alphonsi

Petrus Alphonsi was a prominent figure in medieval Spain, born as Moses Sephardi to a Jewish family. Initially raised in the Jewish faith, he would later undergo a significant transformation, converting to Christianity in 1106. This pivotal event marked a turning point in his life, leading him to adopt the name Petrus Alphonsi, by which he is commonly known, as well as other variations such as Peter Alfonsi or Peter Alphonso.

As a man of diverse talents, Petrus Alphonsi excelled in multiple fields, including medicine, writing, astronomy, and polemics. Born in Islamic Spain, he spent most of his life after conversion in England and France, where he continued to pursue his interests and contribute to various disciplines. His work in astronomy, in particular, showcases his intellectual curiosity and versatility. Although the exact details of his life and work are not extensively documented, it is known that Petrus Alphonsi passed away around 1116, leaving behind a legacy that reflects his complex and multifaceted personality.