Lilia (Latin plural, meaning "lilies" in English; singular, ''lilium'') are pit traps arranged in a

quincunx A quincunx () is a geometric pattern consisting of five points arranged in a cross, with four of them forming a square or rectangle and a fifth at its center. The same pattern has other names, including "in saltire" or "in cross" in heraldry (d ...

pattern dug by the Roman armies in front of their defences. Frequently they had sharpened stakes set inside them as an extra obstacle to attackers. Lilia have been found in front of both Hadrian's Wall in England and the Antonine Wall in Scotland.

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Images of lilies at the Antonine Wall
Fortification (obstacles) {{Fort-stub