From the Mail Online:
"Pat Kirkwood lived for six decades under the cloud of suspicion that she had been the mistress of Prince Philip.
The more she denied the rumour, the more it was believed. Philip himself, adhering to the Royal Family's tradition of declining to comment on matters relating to their private lives, failed to come to her defence. He said nothing, one way or the other, despite her repeatedly imploring him to set the record straight.
Continue reading the Mail Online article and then the wiki entry - and you decide.