The Pyx Chapel or Pyx Chamber, is the oldest surviving part of Westminster Abbey and dates back to the late 11th century. The chamber dates back to the early days of Westminster Abbey when King Edward the Confessor decided to rebuild the previous abbey on the site. Pyx Chamber is in the East Cloister of the church and is part of the Undercroft. Some of the chamber’s original tiles from the 11th can still be seen today.
Pyx Chamber was used as a treasury by the British crown and monastery – at the time, it was considered the most secure room in the London. The room is named “Pyx” after the wooden boxes where silver and gold pieces were kept to await the Trial of Pyx, which ensures the purity of minted coins.
