Your comment got me thinking, Liz, so I did a little digging. I found out that the skull and crossbones are traditional symbols long-used in Spanish cemeteries. Originally they used actual skulls and bones. Also, the Jolly Roger didn’t come into use until 1700 or so. So, it doesn’t seem likely that those Jews were of the pirate variety. But thanks for your comment! Without it, I never would have known all that neat stuff!
Please look at this website re “Jewish pirates”. I am a Freemason and was asked to research the subject of graves from an apparent Jewish cemetry which had skull and crossbones on the graves.This graveyard was recently discovered at the back of the premises owned bu a liquor distillery, ironic?