Linked from
The 9 pages that link to Roger Bacon, each with the reason it gives.
Black powderRelated: His work is among the early European written records of gunpowder formulas.
Ibn al-HaythamRelated: His optical writings drew on ideas transmitted from Ibn al-Haytham.
William of RubruckRelated: Bacon cited Rubruck’s journey as a source of geographic knowledge.
LoupeRelated: His writings document medieval knowledge of lenses used to aid sight.