User blog:THE TERRIFYING TITANIA/Is there a connection between Master Mavis and Zeref?

Can there be a connection between Master Mavis and Zeref? In relation to this questionI have two theories:- First Theory- Zeref was once a member of Fairy Tail (sounds ridiculous I know) and Lumen Histoire might be something related to him. Second Theory - Master Mavis and Zeref are two parts of a same person. One light one dark. Zeref is immortal and that is why Master Mavis is still there in spirit form. If it was possible for anyone then there might have been spirits of dead mages all over Earthland. Tenroujima is the holy land of Fairy Tail then how come Master Mavis not know that Zeref is on there or she kept him hidden on purpose? What do you think?