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How Long Did It Take to Build Château Pèlerin (Atlit)?

Short answer: about 2 years, from 1218 to 1220. This period is our own estimate of the main building phase; the sources do not give one clear start and end.

Pilgrims are said to have helped build it, hence the name Pilgrim's Castle. It was never taken in a siege.

The crusader fortress of Athlit, Israel
The crusader fortress of Athlit, Israel. Photo: אסף.צ (Hebrew Wikipedia) · CC BY-SA 3.0 · Wikimedia Commons · resized

What the sources say about the building period

Construction began 1217–18 (Templars with pilgrims); sieges 1220 and 1265; abandoned 1291. Wikipedia Secondary source

Stone and crew in numbers

Country and type
Israel, castle
Stone in the walls
50,000 to 90,000 m³ Estimate
For comparison
about 28 Olympic pools of stone, or 7,000 truckloads
Average crew
about 4,186 workers (model value: the crew that would need exactly this long, working without a break)

Volume basis: outer wall 6–6.5 m thick, 15–16 m high; inner wall 12 m thick, over 30 m high; two towers 21 x 27 m; length of the cross walls assumed. Checked against measurements. Our estimates come from published dimensions and are shown as a range. The result is a simple model, not a measured fact.

Where the stone came from

Quarried on the spot. The builders cut stone at several places along the Atlit ridge at once, which also created a 2.1 km rock-cut cliff as the eastern defense. Journal of Medieval Military History: The External Fortifications of Atlit Castle Academic source

Plan

Athlit from the 1871–77 Palestine Exploration Fund Survey of Palestine
Athlit from the 1871–77 Palestine Exploration Fund Survey of Palestine. Plan: Palestine Exploration Fund · Public domain · Wikimedia Commons · resized

Legend: tradition, not evidence

Pilgrims built the castle with their own hands, which is why it was called Pilgrim's Castle.

What we know: The Templars began the castle in 1218. Wikipedia says the name probably comes from pilgrims who volunteered their labor. The castle was never taken in a siege and was evacuated by sea in August 1291.

Wikipedia: Château Pèlerin Plausible tradition

Build it yourself

Change the crew, the stone supply and the size, and see how long your own version of Château Pèlerin (Atlit) would take.

Open the calculator with Château Pèlerin / Atlit

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