If Margaret was born 14 Oct 1329 and married on 2 Jul 1340 she was only 11 years old wen married, and 19 when she had her first child. I have been trying to learn why she was married at age 11, but nobody seems to want to address this, and although no totally unusual for this time period, it is rare and usually done for a specific reason, and the reason is usually mentioned somewhere.
