Hakim is an Arabic name, and Tibb means doctor in Arabic too.
Are the herbs grown in England and Ireland comprable to that of mainland Europe? I heard that they can be different in length and depending on the type of land. Obviously the lands of England and Ireland are more lush I assume.
These pain killers are fascinating. I did not know back then that they had any types of analgesics.
There are definite strength and intensity variations in the physical ranges of herbal medicine. My rule of thumb is that if one draws a line from the Nile delta toward Italy and thence to Britain (with Scotland and Ireland in many cases being quite different ecosystems) then rhizome strength is greater the nearer the Nile (length of season/altitude/fertility are all co factors). It was certainly noted in Rome that preparation of henbane (hycosine) had to be done carefully, a strong , egyptian grown , fresh plant could kill whereas a European variant would anaestetise.This comment is only a rule of thumb-lobelia could kill you anywhere you got it for example.
Continental climate winters would be harder on plants , especially at altitude, Britains wetness and relative warmness rather spoils my rule (gulf stream-we are level with Moscow and Canada), by producing some very verdant herbs/crops.
As for the Roman Materia Medica just scroll back through the blog and gallery, I think you will find surprising continuity of usage.