Saint Diadochos of Photiki was a fifth century ascetic whose work is included in the Philokalia

Philokalia

The Philokalia is a collection of texts written between the 4th and 15th centuries by spiritual masters of the Eastern Orthodox hesychast tradition. They were originally written for the guidance and instruction of monks in "the practise of the contemplative life". The collection was compiled in...

.

Scholars have acknowledged his great influence on later Byzantine saints such as Maximos the Confessor, John Climacus

John Climacus

Saint John Climacus , also known as John of the Ladder, John Scholasticus and John Sinaites, was a 7th century Christian monk at the monastery on Mount Sinai. He is revered as a saint by the Roman Catholic, Oriental Orthodox, Eastern Orthodox and Eastern Catholic churches.We have almost no...

, Symeon the New Theologian

Symeon the New Theologian

Symeon the New Theologian was a Byzantine Christian monk and poet who was the last of three saints canonized by the Eastern Orthodox church and given the title of "Theologian"...

, and in general the Hesychast

Hesychasm

Hesychasm is an eremitic tradition of prayer in the Eastern Orthodox Church, and some of the Eastern Catholic Churches, such as the Byzantine Rite, practised by the Hesychast Hesychasm is an eremitic tradition of prayer in the Eastern Orthodox Church, and some of the Eastern Catholic Churches,...

 movement of the 14th century. He has also had great influence in the West via the work, "On the Contemplative Life" (De vita contemplativa) of Julian Pomerius (†498).

His feast day is commemorated on March 29.
Diadochos was born c.