Help with unkown birth dates

Hello guys, for my timeline, the Reign of King John of France, I intend to have Enguerrand de Coucy meet Princess Margaret of Scotland (b.unknown - 1346/1347) , a daughter of Robert I of Scotland. I search over Wikipedia and the net and only found that she died around 1346/1347. Most of information was about her sister Marjory of Scotland. Is it to me to invent a birth date for my story or do something else ?

Any help will be much appreciated !!
 
The rule that I use for the TL I'm writing is that it's acceptable to pick a date for something that happened at an unknown date OTL as long as it's in a probable range.

I don't think anybody could fault you for inventing a death date that was lost to history OTL.
 
If you check Her Mother's Page it gives an estimate at between 1315 and 1323 for both Margaret and Matilda, so yeah late 1310s is likely when she was born.

I would say that so long as the date is plausible then yeah, it should be fine.
 
Usually the date of the parents' births, marriage and other issue offer a nice framework in which to guesstimate a date.
 
Alright. thanks guys for your answers, I really appreciate it. I think I will pick the year 1315 for my story making her 16 when she will meet Coucy who is 18.

Thanks again !
 
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