The Risāla has come down to us through Ibn Abī Ṭāhir Ṭayfūr (d. 893), who included it in volume 12 of his al-Manthūr wa-l-manẓūm, and its authenticity has not been questioned by modern scholars. It can be dated with some precision to between 790 and 797. At the …
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“ Risālat Abī l-Rabīʿ Muḥammad ibn al-Layth allatī katabahā li-l-Rashīd ilā Qusṭanṭīn malik al-Rūm”, in:
Christian-Muslim Relations 600 - 1500, General Editor David Thomas.
Consulted online on 17 September 2019 <http://dx.doi.org/10.1163/1877-8054_cmri_COM_23546>