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The former name of Knockin was Cnukyn. The village comprises mainly historic detached buildings in a rural setting. Much of Knockin was owned by the Earl of Bradford until it was sold off in lots to meet other financial demands. The Earl still owns the cricket pitch and other small pockets of land in the area. The local public house is called the Bradford Arms and displays the Bradford family coat of arms. The pub also has a clock with three faces, hung outside above the main entrance. The motto displayed on the sign is that of the Bridgeman family Earls of Bradford "Nec temere nec timide" (Neither rashly nor timidly).
All that remains of Knockin Castle today is a large tree-covered mound of earth. The castle was of a motte and bailey design and was constructed between 1154-1160 under the authority of Guy le Strange. Ownership remained with the family for much of the Middle Ages but by 1540 it was described as "ruinous". Like most Shropshire castles which are now only marked by grassy sites, its stones live on in a number of buildings in the area.
The parish church of St Mary was founded by Ralph Le Strange between 1182 and 1195 as a chapel for the castle. It has a Norman chancel, nave and north aisle but the building was heavily restored in 1846. Its graveyard was consecrated in 1817; before then at least some burials took place at Kinnerley. It contains CWGC-registered war graves of two officers and two soldiers of the British Army of World War I.
One of the radio telescopes that make up the Jodrell Bank MERLIN (Multi-Element Radio Linked Interferometer Network) radio telescope array is in Knockin. The array links several observing stations that together form a powerful telescope.
- "A Vision Of Britain Through Time: Knockin". University of Portsmouth and others. Retrieved 2015-01-24.
- "Knockin Castle". English Heritage. Retrieved 2015-01-24.
- "About the Parish". St Mary's Church, Knockin. Retrieved 2015-01-24.
-  "CWGC Cemetery Report. Breakdown obtained from casualty record"]. Commonwealth War Graves Commission.
- "The Multi-Telescope-Radio-Linked-Interferometer-Network (MERLIN)". University of Manchester. Retrieved 2015-01-24.
- "The Multi-Telescope-Radio-Linked-Interferometer". University of Manchester. Retrieved 2015-01-24.
Media related to Knockin at Wikimedia Commons