What happened if a queen gave birth to twin sons and they both survived to adulthood would they both be heir to the throne ? Would they Rule together? Would they choose their favorite? Has this ever happened historically?

by Express_Nebula_7434
WelfOnTheShelf

u/DanKensington must still be sleeping, so I can sneak in and repost the list of previous answers for this question that he compiled:

u/I-want-to-roleplay and u/Real_Hist each examine such cases in this thread;

and u/WelfOnTheShelf looks at several more cases here.

WelfOnTheShelf and u/TywinDeVillena also have several more twin cases to examine.