Morton was the first to find his tongue.
"My lords," said he, "this is a game of life and death, and the winner will not be the cleverest or the strongest, but the readiest.

If we do not destroy this man, we are lost.

We must strike him down, this very evening, not the day after to-morrow." Everyone applauded, even Ruthven, who, still pale and feverish from riotous living, promised not to be behindhand.

The only point changed, on Morton's suggestion, was that the murder should take place next day; for, in the opinion of all, not less than a day's interval was needed to collect the minor conspirators, who numbered not less than five hundred.
The next day, which was Saturday, March 9th, 1566, Mary Stuart, who had inherited from her father, James V, a dislike of ceremony and the need of liberty, had invited to supper with her six persons, Rizzio among the number.

Darnley, informed of this in the morning, immediately gave notice of it to the conspirators, telling them that he himself would let them into the palace between six and seven o'clock in the evening.