Caïssa originated in a 658-line poem called Scacchia Ludus published in 1527 by
Tum geminae velut extremis in cornibus arces
hinc atque hinc altis stant propugnacula muris,
quae dorso immanes gestant in bella Elephanti.
"Then twin, as if at the ends, citadels in the corners,
here and here stand ramparts with high walls,
which, immense, are carried into war on the back by elephants."
A leaked unauthorized 742-line draft version was published in 1525. Its text is very different, and in it Caïssa is called Scacchia, the chess rook is a
This led to the modern name "castle" for the chess rook, and thus the term "castling", and the modern shape of the European rook chesspiece. Also for a time, some chess players in Europe called the rook "elephant" and the bishop "archer". In German, Schütze ("archer") became a general word for a chess bishop until displaced by Läufer ("runner") in the 18th century.