Prior Castell's Clock is an astronomical clock in Durham Cathedral.
History and description
The clock was placed in the cathedral between 1494 and 1519, during the tenure of Prior Thomas Castell. Dean Hunt renovated it between 1620 and 1638.
It was originally on the east side of the rood screen, but was moved in 1593 to its current location in the south transept.
References
Prior Castell's Clock Wikipedia(Text) CC BY-SA