Glastonbury, in the county of Somerset in South Western England, has been a place of sanctity and pilgrimage for at least several thousand years.
Glastonbury Tor ('the Tor') with its single tower, dominates the area, sticking up well above the flat Somerset Levels, which are at, or a bit below, sea level.
It is not clear when the Glastonbury area was first occupied. The Sweet Track (dated exactly to 3806 BCE) is the oldest marsh walkway known. It's not far from Meare, a former island NW of Glastonbury. The first people we know occupied Ynys Witrin, or the Isle of Glass or 'seeing', were the Celtic Druids. But Glastonbury Tor is prominent to the extent that, when people first occupied the area at least 12,000 years ago, they will have come here.
It is said that Glastonbury (at that time a small cluster of islands rising above the submerged Somerset Levels) was the location of one of three Druidic perpetual choirs. The other two were said to be on the islands of Anglesey (north west Wales, where the Druids made their last stand against the Romans), and Iona (further north, off Mull on the west coast of Scotland, where St Columba brought Catholicism to Scotland, though Celtic Christianity had existed for some centuries beforehand). These eternal choirs made music twenty-four hours a day, three hundred and sixty five days a year. They literally enchanted the land.
According to tradition, in 37 AD, Joseph of Arimathaea, an Essene who provided Christ with his tomb and protected him during his mission, came here after the crucifixion as a refugee. He set foot onto Ynys Witrin on Wearyall Hill, where he planted his Jerusalem Thorn staff and rested his feet from the long journey. The staff took root, and it is said that a scion of that tree still grows on Wearyall Hill to this day.
Joseph and his twelve acolytes founded and built the world's first purpose-built Christian church here on the site of the oldest part of the Abbey at the western end. Hence that the Orthodox church recognises Glastonbury as 'primary in the West'. Rome doesn't agree.