From published sources at the time :--
When Mary Queen of Scots first appeared in public to show her new child to her loving subjects they cried out with one voice "Get back tae France ye French hoor an tack yer Italian bastard wi ye".
She backed up this popularly expressed opinion by later giving birth to twins who could not have been fathered by her, then, husband at the time of conception.

Do not take my word for it---read your history