Tetraconch: A building composed of four conchs (conch: a semicircular niche surmounted by a half-dome).
Theodosios: Monk and saint, founder of the largest and most important coenobium in the Judean desert. Born in Cappadocia in 423; died in his monastery in 529. He arrived in Palestine in 451, and founded his monastery in 479. In 494 he was given responsibility for the coenobitic monasteries in the Jerusalem region.
Theodosios I: Augustus from 379 and emperor from 383 to 395. He reinforced the urban and especially the agricultural economy and collaborated with the barbarians by giving them positions in the army. Concerning the religious affairs, he condemned the Arianism and convened the First Counsil of Constantinople, in 381.
Theodosios II: Byzantine emperor from 408 to 450, son of Arkadios. He paid special attention to the reconstruction of public buildings in Constantinople and to its fortification by a new wall, known as the Theodosian Walls. He did not meet any particular problems in the field of foreign policy, whereas domestically he promoted affairs of justice and higher education. However, in ecclesiastical issues he caused conflicts by supporting the heresy of Nestorianism.
Tribelon: In a church, a triple arcade leading from the narthex into the nave.
Triclinium: area of reception and/or dining room of the Roman, and later of the Byzantine villas and palaces. The ground plan was rectangular and at its narrow side at least one arch was formed. A semicircular pew, known as stibadion or accubitum was built perimetrically, whereas in front of it there was a semicircular table, known as sigma.