In an illuminated tower chamber a king in an ermine robe gestures at a misty swamp of sunken castles while a bored prince sits on the window seat.

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King of Swamp Castle

When I first came here, this was all swamp. Everyone said I was daft to build a castle on a swamp... It sank into the swamp.

— Monty Python and the Holy Grail · 1975

Behind the line

What it means

Our interpretation.

The speech is a deadpan tribute to stubbornness: the king's whole life is a sunk-cost fallacy delivered as a triumph, with the failures counted off like achievements. It has become the go-to quote for building something stubbornly on bad foundations, and for any project that fails three times and is presented as a success on the fourth.

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In context

Spoilers for Monty Python and the Holy GrailShow the scene

In Monty Python and the Holy Grail (1975), the King of Swamp Castle lectures his son Prince Herbert on the kingdom he will inherit, which he built from nothing. Everyone told him he was daft to build a castle on a swamp, so he built one anyway, just to show them, and it sank. He built a second, which sank, and a third, which burned down, fell over and then sank. The fourth stayed up, and that, he tells Herbert, is what he is getting. Herbert only wants to sing, so his father locks him in the tower, and the note he fires out of the window summons Sir Lancelot.

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