According to Wikipedia, "several royal marriages were proposed for" James Hamilton, 3rd Earl of Arran, "but he eventually never married". However, WikiTree previously showed that he was married both (in 1550) to Isabel Elphinstone and (obviously much later) to Margaret Seton (who was not born until about 1551). The former supposed wife was in fact married in the same year to a different James Hamilton (third cousin of his namesake the 3rd Earl of Arran) and the latter supposed wife was in fact married to Claud Hamilton (younger brother of the 3rd Earl of Arran).
Both Scots Peerage Vol. iv, p. 368-9 and an old but very informative version of the Dictionary of National Biography Vol. 24:173-176 discuss the 3rd Earl of Arran's marriage proposals, but do not show any actual marriages for him before his mind left.
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E > Elphinstone | H > Hamilton > Isabel (Elphinstone) Hamilton
Categories: Clan Elphinstone
Wife of James (Hamilton) Hamilton IIIrd of Haggs — married 1550 [location unknown]
https://www.wikitree.com/wiki/Hamilton-23945
John (Hamilton) Hamilton IInd of Haggs and Janet Maxwell Hamilton
Wife of James Hamilton 3rd Earl of Arran — married 1550 [location unknown]
https://www.wikitree.com/wiki/Hamilton-2331
Son of James Hamilton Duke of Châtellerault and Margaret Douglas Dowager Countess of Arran