MAXWELL, John 2nd of Calderwood, Sir ^{1 2 3}

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John married Margaret BORTHWICK, daughter of Wlliam BORTHWICK 3rd of that Ilk, then Lord Borthwick and Beatrice SINCLAIR.¹ (Margaret BORTHWICK was born about 1412.)

  Marriage Notes:

"Margaret, married to Sir John Maxwell of Calderwood, before 4 December 1450."

from Scots Peerage (vol 2)

Note:

This dating of the marriage is not particularly helpful.
It must have been quite a time before December 1450, since the couple's grandson, Thomas, Earl of Arran, married a princess of Scots before 26 April 1467. ¹