 The ritual employs the sacred "" (, "chrism"), which is said to contain a remnant of oil blessed by the Twelve Apostles.In order to maintain the apostolic blessing unbroken, the container is never completely emptied but it is refilled as needed, usually at a ceremony held on Holy Thursday at the Patriarchate of Constantinople or the patriarchal cathedrals of the autocephalous churches.At the Patriarchate of Constantinople, the process is under the care of the "Archontes Myrepsoi", lay officials of the Patriarchate.