In an old church, a piscina is nearly always found in the chancel, and here, too, were the Sedilia or seats for the officiating clergy, the prior, sub-prior, and the deacon, the last-named occupying the lowest seat.
"Our Homeland Churches and How to Study Them"
Sidney Heath
Sometimes, as at St Mary's, Shrewsbury, where successive generations of builders were very faithful to the remains of earlier work, the old Sedilia of a twelfth century chancel have been left in place.
"The Ground Plan of the English Parish Church"
A. Hamilton Thompson
47. "Expense circa Sedilia claustri" is the heading of an account for wood bought and for carpenter's work.
"The Care of Books"
John Willis Clark