This study, the sixth publication of the findings of the Corpus of the Inscriptions of Campā project, focuses on the inscriptions of the 15th century. Analysis and translations — notably of the entire set of accessible inscriptions engraved on the back-slabs of sculptural steles — reveal the previously unknown name of a king — Śrī Viṣṇujāti Vīrabhadravarmadeva, son of Śrī Jayasiṁhavarmadeva — who reigned through the century’s first four decades. The distribution of 15th-century royal inscriptions from Quảng Nam to Đồng Nai serves to refute revisionist claims that Campā was never a unified kingdom. The epigraphical evidence suggests that, on the contrary, Campā in this period was a land of significant territorial extent ruled by a rather powerful king.