I have managed to retrieve a basic number of links to the blogs I regularly visit on the web. I'll add more as I find them. I've noticed a few have changed urls and/or names, so this was probably an advantageous occurrence.
"Slavery ended in medieval Europe only because the church extended its sacraments to all slaves and then managed to impose a ban on the enslavement of Christians (and of Jews). Within the context of medieval Europe, that prohibition was effectively a rule of universal abolition. "— Rodney Stark