I. Classical antiquity
Pilgrimage, defined here as a journey of considerable length to a sacred place, undertaken for religious reasons, was a common practice in all of antiquity, not solely a Christian phenomenon.
A. Greek world
The best-documented form is the state pilgrimage ( theōría ), in which the Greek city-states sent out envoys (theōroí) to attend religious festivals, announce their own festivals or consult oracles. However, festivals dre…