Christian feast day: Stephen (old calendar Eastern Orthodox)

Saint Stephen's Day, also called the Feast of Saint Stephen, is a Christian saint's day to commemorate Saint Stephen, the first Christian martyr or protomartyr, celebrated on 26 December in Western Christianity and 27 December in Eastern Christianity. The Eastern Orthodox churches that adhere to the Julian calendar mark Saint Stephen's Day on 27 December according to that calendar, which places it on 9 January of the Gregorian calendar used in civil contexts. In Western Christian denominations, Saint Stephen's Day marks the second day of Christmastide.

Eastern Orthodoxy, otherwise known as Eastern Orthodox Christianity or Byzantine Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream Eastern Orthodox Church is organised into autocephalous churches independent from each other. In the 21st century, the number of mainstream autocephalous churches is seventeen; there also exist autocephalous churches unrecognized by those mainstream ones. Autocephalous churches choose their own primate. Autocephalous churches can have jurisdiction (authority) over other churches, some of which have the status of "autonomous" which means they have more autonomy than simple eparchies.