[1] The marriage was unpopular, especially after Lord Boyd and his brother, Sir Alexander Boyd, were later convicted of treason for abducting young James III, contriving the marriage of Thomas to Princess Mary Stewart (which was considered as an unforgivable insult by King James III), and establishing the regency.
While Thomas Boyd and his father were out of the country, negotiating the cession of Orkney to Scotland and King James III's marriage to Margaret of Denmark, the regency was overthrown, and they were attainted for high treason in 1469.
However, Thomas fulfilled his mission, that of bringing the King's bride Margaret to Scotland, and then warned by his wife, he escaped with her back to Denmark.
Upon their marriage, the Isle of Arran was given to them as Mary's dowry, and Law Castle in North Ayrshire was built for the couple.
She was however confined at Kilmarnock, and Thomas was summoned to appear within sixty days, which he failed to do so; thus, his marriage to the King's sister was declared null and void, and she was then compelled to marry James, Lord Hamilton.