A Saint and patriarch. He was the 22nd Patriarch of Alexandria (380-385). He is commemorated on the 26th of Abib. He was a disciple of Athanasius of Alexandria, and he attended the Council of Constantinople in 381.
He left a collection of canonical law in Coptic that is a translation from the original Greek. A prayer on the Fraction is attributed to Timothy but it is by no means certain whether it belongs to Timothy I or his successor of the same name.