William, patron of the Welsh Rugby Union, posted a personal post denoted with a W at the end of his message - in honour of Williams, who has died at the age of 74.
The prince said on X, formerly known as Twitter: "There was no one quite like him on the rugby field. A true @WelshRugbyUnion great, my thoughts are with JPR Williams' family and friends. W."
Williams, a fearless player known for his aggressive and attacking style, won 55 Wales caps and started all eight Tests on victorious Lions tours to New Zealand in 1971 and South Africa three years later.
He was revered among fellow Wales greats like Sir Gareth Edwards, Barry John, Phil Bennett and Gerald Davies and regarded as one of rugby union's finest players.
A star performer during Welsh rugby's 1970s golden era, he also captained his country on five occasions.
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