Queen Vashti refused to comply with the command of her husband the king of Persia to put herself on display before his friends, which angered the king (Esther 1.12).
Therefore, he brought together his advisers to see what they would say should be done to the queen,
“What shall we do to Queen Vashti, according to law, because she did not obey the command of King Ahasuerus brought to her by the eunuchs?” (Esther 1:13-15).
This was a personal matter between the king and the queen. Then again, it was a public matter, because he wanted her on public display, and she refused to do it, and we learn later in the story that his advisers feared other women would do the same thing, showing that it was growing into a public issue.
Most of us do not live in the world of politics, but everything that politicians do and everything their families do come under the public microscope.