Isaias I (sometimes spelled Esaias, Jeaias or Jesaias)[1] was the Ecumenical Patriarch of Constantinople from 1323 to 1334.

The Byzantine Emperor Andronicus II, had Isaias confined to the monastery section of the Magnaura school in Constantinople in 1327, possibly due to the Patriarch's support for the emperor's grandson, Andronicus III during the Civil War. Upon Andronicus II overthrow by his grandson on May 23/24, 1328, a delegation was sent to the monastery to retrieved Isaias. On his way back to palace, Isaias was escorted not but the usual ecclesiastics, but by a troupe of musicians, dancing girls and comedians, one of whom had him so helpless with laughter that he almost fell off his horse.[2]

Preceded by
Gerasimos I
Patriarch of Constantinople
Succeeded by
John XIV


  1. G. Ostrogorsky, History of the Byzantine State, Rutgers University, 1969, p586.
  2. J. Norwrwich, A Short History of Byzantium, Alfred A. Knopf Pub., 1997, p338.

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