Free Castling Chess

If you had a Java-capable browser, you could play Free Castling Chess here.
Keys "s"=save "l"=load "b"=back once

You may castle, whether or not you are in check, passing over squares under attack and/or occupied squares, so long as neither king nor rook have been moved and the rook ends up on the far side of the king, not beyond the king's square.

This was the norm in Italy up into the 19th century.

Free Castling
Tim Harding on Free Castling
Renaissance Chess

Chess Variants

Meet Ed

These are simple illustrations rather than strong opponents.

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