Leechbook

This Saxon manuscript has a dignity which is unique, for it is the oldest existing leech book written in the vernacular.

Source: wiktionary

One of the old Leech Books gives the formula for a salve against the "elfin race and nocturnal goblin visitors." Fourteen herbs, including wormwood, viper's bugloss and fennel, were first gathered.

Source: wiktionary

2004, J. P. Griffin treacle and the foundation of medicines regulation The first was directly from Byzantine or other eastern sources, for example a Saxon leechbook of the 11th century records that Abel the Patriarch of Jerusalem sent Mithridatium or theriac to King Alfred the Great, who died on 26 October 899

Source: wiktionary