[1] In 925, the new governor to Egypt, Takin al-Khazari, imposed the poll tax on Christians who had until then been exempt (bishops, monks and the infirm).
To protest this change of policy, the monasteries of Egypt elected Moses of Dayr al-Suryan to be their envoy to the Caliph al-Muqtadir in Baghdad.
[1] Moses brought back 250 Syriac codices collected in northern Syria and Mesopotamia, in places like Tikrit, Reshaina and Harran.
Most of these were distributed to western libraries in the 18th and 19th centuries, and only a small portion of the collection remains in Dayr al-Suryan today.
[4] The latest mention of Moses as abbot is found in a note to another Syriac biblical manuscript in the British Library, Add MS 14525, which dates to 943 or 944.