Two liturgical innovations are attributed to him, the prayers on Good Friday at the church of the Virgin and the recital of the Nicene Creed at every service, although the last is also ascribed to Peter the Fuller.
The British historian F. H. Blackburne Daniel considered him to be a man of bad character, as Timothy allegedly adopted the Non-Chalcedonian doctrines out of ambition rather than conviction.
[1] He sent circular letters to all the bishops, which he requested them to subscribe and assent to the deposition of Macedonius II of Constantinople.
[2] He also induced the emperor to persecute the clergy, monks, and laity who adhered to Macedonius II, many of whom were banished to the Oasis in the Thebaid.
Within a year of his accession Timothy I directed that the Ter Sanctus should be recited with the addition of "Who was crucified for us", which led to disturbances in two churches, in which many were slain over 4 and 5 November, and to a terrible riot the following day which nearly caused the deposition of the Emperor Anastasius I.