The fourth and final chapter focuses on the patronage of one individual, who emerges from surviving material as the most prolific manuscript patron of late medieval Rum. The three manuscripts discussed in this chapter were commissioned by Sharaf al-Din Sati ibn Hasan, an amir, history writer and Mevlevi devotee. The key manuscripts are a copy of the Masnavi of Sultan Walad from 1366, a two-volume Divan-i Kabir from 1368 and a 1372 copy of the Masnavi, both by Jalal al-Din Rumi. Several manuscripts belonging to Sati’s son, Mustanjid, are also considered. Although a production centre is not named in the manuscripts, the patron and his family were based in Erzincan. This chapter outlines and contextualises the political and cultural activities of Sati and Mustanjid and considers where the manuscripts may have been produced. Moreover, the distinctiveness of the manuscripts’ illumination, and the patron’s connection to the Jalayirids, generates a discussion concerning the relationship between the arts of the books of Rum and the Mongol successor states.