Dear Colleagues,
I am not sure if this has been brought to light yet, but I recently came across a 1634 document where the 80-year-old priest Miguel de Ovalle mentions that his uncle Diego Sánchez de Mora, ancestor to many of us, was originally from Ciudad Real (Castilla - La Mancha), the same place of origin as Juan Gutiérrez de Bocanegra.
Best regards,
Erik Reynoso