The Sarantine Mosaic is a historical fantasy duology by Guy Gavriel Kay, comprising Sailing to Sarantium and Lord of Emperors. The titles of the novels allude to works by poet W. B. Yeats. The story's setting is based on the 6th century Mediterranean world, and the looming conflict between the Eastern Roman Empire and the Ostrogothic kingdom of Italy that had replaced the Western Roman Empire. Varena, the capital of Batiara, alludes to Ravenna, the Ostrogothic capital, while Sarantium, the capital of Trakesia, is inspired by Byzantium or Constantinople. The novels The Lions of Al-Rassan and The Last Light of the Sun also take place in that unnamed world, although in different settings. In the series we are also briefly acquainted with the character Ashar ibn Ashar, who is the creator of th