This post will be important.  A lot of Medieval Middle Eastern recipes do not have measurements, those that do have period measurements.  Here is a listing with modern conversions.

1 lb (Ratl) = 400 g

1 ounce (uqiya) = 3.3 grams

1 dinar = 4.25 grams

1 dirham = 3 grams

1 rub (a quarter of a measure called qadah = 23.5 deciliters or about 1 measuring cup (American)

1 danaq = .5 grams

(Perry, pp. 22)

These are the measurements used for making mead when measuring out the spices.  Ok roughly.  I used the American grams that measured more in the 3 gram ranger then then 4.25 gram range.