Cat door in Exeter cathedral. The cathedral accounts include a record of carpenters being paid to make it around four hundred years ago. Entries for the expenses of keeping a cat go back a further couple of centuries: one old penny a week to keep the building free of mice and rats.
The cathedral still has a resident cat. Search the web and it’s possible to find pictures with a present-day cat poking its head out of the hole. Getting those pictures must have taken a lot of time and patience!