What needs to be considered to show that under a grave marker lies a Jewish person?
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This very much depends on who you want to accept it. For some authorities a Magen David or a Hebrew inscription (especially ת.נ.צ.ב.ה) may be enough, but for others the gravestone alone is not sufficient, and other proof may be required (for example, being buried in a Jewish graveyard). For the Rabbanut in Israel a photo of a gravestone with a Magen David is usually not considered sufficient proof on its own, and they may insist on going through conversion before accepting someone as Jewish if that is the only proof that exists.