Etymology Map
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Castle

3 stages from Latin to English.

Today it means a large fortified building of the Middle Ages

Where does the word "castle" come from? It comes from Latin castellum, passing through Old North French before entering English (1000s).

1
Stage 1 of 3
castellum
Latin · ancient
"small fort"
a diminutive of 'castrum', fort, which also survives in place-names like Chester and Lancaster
2
Stage 2 of 3
castel
Old North French · medieval
"fortified residence"
Norman French kept the hard 'c' that Parisian French softened into 'chastel', modern 'château'
3
Stage 3 of 3
castle
English · 1000s
"a fortified stronghold"
spread with the stone keeps the Normans built to control England after 1066
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Read the full story

Castle’s story begins in Latin: castellum meant “small fort.” A diminutive of 'castrum', fort, which also survives in place-names like Chester and Lancaster. By medieval, the word had taken hold in Old North French as castel. Norman French kept the hard 'c' that Parisian French softened into 'chastel', modern 'château'. It reached English by 1000s as castle. Spread with the stone keeps the Normans built to control England after 1066. Today, castle means a large fortified building of the Middle Ages.