Iconographic programme: The elaboration and positioning of wall paintings in a Byzantine church, according to unwritten rules. For example, the customary depiction of Christ Pantokrator on the dome.
Imperial door: the entrance to the naos (main church).
Income from the land: the revenue from the cultivation of land.
Independent small Greek states: the domains of Theodore Magafas or Morotheodore in Philadelphia, of Manuel Maurozomes in the valley of the Meander River, of Sabas Asidinos at Sampson near Miletus, of the Grand Komnenoi at Trebizond, of Leo Sgouros at Nauplia, Argos and Corinth and of Leo Chamaretos in Lakedaimon.
Interpretation of Dionysios of Fourna: A manual containing guidelines for painters, written between 1728 and 1733 on Mount Athos by the monk Dionysios, who came from Fourna in Eurytaneia.
Irene Eulogia Choumnaina (1291-ca. 1355): Daughter of Nikephoros Choumnos and widow of the despotes John Palaiologos, son of Andronikos II. She was only 16 when she became a widow. She then became a nun and spent her fortune on charitable works and on the restoration of the Philanthropos Soter monastery. She was a student of Theoleptos through whom she acquired an extensive education. She owned a rich personal library student and financed the copying of manuscripts. She was an active anti-Palamite.
Irene Metochites: Daughter of Theodore Metochites, she was particularly learned, having receiving the same education as her brother from Nikephoros Gregoras.
Isaac Argyros (1300-ca.1375): Mathematician, astronomer and theologian, student of Nikephoros Gregoras and the most important scholar and researcher of the astronomy of Ptolemy. Argyros wrote works on mathematics and astronomy as well as three anti-Palamite theological treatises.
Isidore I: Patriarch of Constantinople (1347-ca. 1350). He was a fervent supporter of the hesychast teachings. He tried to improve relations between the Patriarchate of Constantinople and the Church of Rome.