Darnley, amazed at this force of will in a young queen who had loved him enough to raise him to her, and not believing that she could find it in herself, sought in her entourage for some secret and influential adviser who might have inspired her with it.

His suspicions fell on Rizzio.
In reality, to whatever cause Rizzio owed his power (and to even the most clear-sighted historians this point has always remained obscure), be it that he ruled as lover, be it that he advised as minister, his counsels as long as he lived were always given for the greater glory of the queen.

Sprung from so low, he at least wished to show himself worthy, of having risen so high, and owing everything to Mary, he tried to repay her with devotion.

Thus Darnley was not mistaken, and it was indeed Rizzio who, in despair at having helped to bring about a union which he foresaw must become so unfortunate, gave Mary the advice not to give up any of her power to one who already possessed much more than he deserved, in possessing her person.
Darnley, like all persons of both weak and violent character, disbelieved in the persistence of will in others, unless this will was sustained by an outside influence.

He thought that in ridding himself of Rizzio he could not fail to gain the day, since, as he believed, he alone was opposing the grant of this great desire of his, the crown matrimonial.