Saracen

Saracen was a term widely used among Christian writers in Europe during the Middle Ages. The term's meaning evolved during its history. In the early centuries AD, Greek and Latin writings used this term to refer to the people who lived in desert areas in and near the Roman province of Arabia, and who were specifically distinguished as a people from others known as Arabs. In Europe during the Early Medieval era, the term came to be associated with Arab tribes as well. By the 12th century, "Saracen" had become synonymous with "Muslim" in Medieval Latin literature. Such expansion in the meaning of the term had begun centuries earlier among the Byzantine Romans, as evidenced in documents from the 8th century. In the Western languages before the 16th century, "Saracen" was commonly used to refer to Muslim Arabs, and the words "Muslim" and "Islam" were generally not used (with a few isolated exceptions).

Ptolemy's 2nd century work, Geography, describes Sarakēnē (Ancient Greek: Σαρακηνή) as a region in the northern Sinai Peninsula. Ptolemy also mentions a people called the Sarakēnoi (Ancient Greek: οἱ Σαρακηνοί) living in the northwestern Arabian Peninsula (near neighbor to the Sinai).Eusebius in his Ecclesiastical history narrates an account wherein Pope Dionysius of Alexandria mentions Saracens in a letter while describing the persecution of Christians by the Roman emperor Decius: "Many were, in the Arabian mountain, enslaved by the barbarous 'sarkenoi'." The Augustan History also refers to an attack by "Saraceni" on Pescennius Niger's army in Egypt in 193, but provides little information as to identifying them.

...
Wikipedia