The Letter of the Archimandrites of Arabia, dated to 570 AD, is a Syriac Monophysite declaration of faith signed by 137 monastic leaders in Roman Arabia. Addressed to Jacob Baradaeus and other Monophysite bishops, the letter intervenes in Christological disputes in opposition to Tritheism. Written in Greek, it survives today in Syriac translation, in a corpus of Monophysite texts from southwest Syria compiled in the late sixth century, known as the Documenta Monophysitarum. The same collection of letters also has a letter containing the response of Jacob. The Letter of the Archimandrites is the most well known document from the Documenta Monophysitarum, and reveals a large rural zone across Roman Arabia dotted with churches and monasteries that were well-connected to the Arab leaders in this time. The letter is an important source for pre-Islamic Arabian Christianity.