Metousiosis is a Greek term (μετουσίωσις) that means, literally, a change of οὐσία (essence, inner reality). Cyril Lucaris (or Lucar), the Patriarch of Alexandria and later of Constantinople who died in 1638, used this Greek term to express the idea for which the Latin term is transsubstantiatio (transubstantiation), which likewise literally means a change of substantia (substance, inner reality), using, in the 1629 Latin text of his The Eastern Confession of the Orthodox Faith, the term transsubstantiatio, and, in the Greek translation published in 1633, the term μετουσίωσις.