Thank you Paul, well back in the day when I was taught history in schools much was still 'hinged' on the reigns and names of various kings, and how their inter-marriages interfered with politics and diplomacy then, this has to some extent remained with me.
More than one Scottish king married a Danish/Norwegian king's daughter or sister, this was how the Hebrides became Scottish - a pawn for a dowry - that was never paid.
King Christian II of Denmark was married to a sister of HRE Charles V, Isabella of Austria, and her Catholicism in a country becoming moe and more Protestant was a part - imo - of the reasons for the deposition of Christian II in 1523, and her escape with their children to the Netherlands and the HRE.
Or James VI of Scotland and I of England who married Anne, the sister of Christian IV of Denmark-Norway who became the parents of Charles I who was beheaded den 1648/49.
Kind regards to you too.