The Parody of A Caged Parrot vs Caesar's Wife

In the Supreme Court's judgment on the bail plea of Arvind Kejriwal, we came across a reference to the CBI being termed as "A Caged Parrot" and Justice Ujjal Bhuyan's remark asking the CBI to take steps to remove the perception of being a caged parrot. He said that "like Caesar's wife it should be above suspicion while conducting an investigation.

I wanted to know what was Caesar's wife's suspicious act. Why the term "Caesar's Wife" became a parable? I googled and found this article on Wikipedia which clarified my doubts.

When Caesar was elected to be the Chief Priest of the Roman State Religion, one of his wives, Pompeia hosted a festival of Good Goddess " Bona Dea in 62 BC. It was a festival for ladies and no men were allowed. But a male managed to enter there disguised as a woman and got caught. It was a disgrace and Caesar divorced Pompeia saying that his wife should be above suspicion.

This incident gave rise to the proverb "Caesar's wife should be above suspicion".

Here is the link to the story.