Legality of Cannabis by U.S. Jurisdiction 7th8th9th10th11th12th13th14th15th16th17th See also: Category:12th-century scientists Pages in category "12th-century inventors" The following 2 pages are in this category, out of 2 total. This list may not reflect recent changes. J Ismail al-JazariT Sharaf al-Din al-Tusi