What did king Canute lamented sitting on his chair?

King Canute, in a famous anecdote, lamented while sitting on his throne that even a king could not command the tides. He demonstrated this by ordering the sea to stop advancing, only to have the waves continue to wash over his feet. This act was meant to illustrate the limits of royal power and the futility of trying to control nature, emphasizing humility and the inevitability of divine will.