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Double portcullis gates at Petersberg Citadel, Erfurt. Portcullises fortified the entrances to many medieval castles, securely closing them off during times of attack or siege. Every portcullis was mounted in vertical grooves in the walls of the castle and could be raised or lowered quickly by using chains or ropes attached to an internal winch ...
The crowned portcullis device is ancient and is in the public domain where it originated, in the UK. However, the arrangement of the device and the text would not necessarily be in the public domain in the UK.
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The introduction of gunpowder made tall castle walls vulnerable to fire from heavy cannon, which prompted the trace italienne style from the 16th century. In these fortifications, the height of the curtain walls was reduced, and beyond the ditch, additional outworks such as ravelins and tenailles were added to protect the curtain walls from ...