 Complete the following phrase:  Both Mary, Queen of Scots, and Lord Darnley had strong claims on the English throne through their mutual grandmother Margaret Tudor. This eventually led to the accession of the couples only child James as King of Scotland, England, and Ireland in 1603. However, this was a Personal Union, as the three Kingdoms shared a monarch, but had separate governments, churches, and institutions. Indeed, the personal union did not prevent an armed conflict, known as the 