The last line is something about somebody giving something. If the top lines are part of a charm, the last line might be something about who they got it from (or got the ingredients from). If so, a presbyter would be one of the more likely people to offer this kind of advice or information (or ingredients) in the Middle Ages.
Whether it's plural depends on the region. If it's southern, then yes, plural, if Saxon or Norman, then the "en" could be the article (the presbiter). They didn't use the word "the" in many areas and I've noticed that Saxon writings blend German with the northern grammar.
Whether it's plural depends on the region. If it's southern, then yes, plural, if Saxon or Norman, then the "en" could be the article (the presbiter). They didn't use the word "the" in many areas and I've noticed that Saxon writings blend German with the northern grammar.