What is “a barbican”?

The story behind the answer

A barbican is an outwork placed in front of a castle’s main gate to create a controlled, defensible approach. Typically a walled passage or small fortress with flanking towers, it funneled attackers into a narrow kill zone covered by arrow slits, murder holes, and multiple portcullises, while defenders remained protected. By forcing enemies to pause and bunch up before reaching the actual gatehouse, it bought precious time and multiplied the defenders’ advantage.

Barbicans became widespread in the 13th–15th centuries as siege warfare intensified. Many were linked to the main walls by a drawbridge across a moat. Famous survivors include the massive circular Barbican of Kraków and the barbican at Walmgate Bar in York. London’s “Barbican” district even preserves the name of a medieval example that once guarded the City’s perimeter.