This text, known as the Chronicon orientale, has been mis-attributed to Ibn al-Rāhib since the 17th century.[1] In 1263, he completed a work on the Coptic language, including a rhymed vocabulary and a grammar. Only the prologue and the grammar survive. Written in the tradition of Arabic lexicography, his grammar is superior to the other Coptic manuals of his time.[1] The Kitāb al-shifāʾ (Book of Healing), completed in 1267–68, is a work of Christology based exclusively on Biblical exegesis.