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Catholic Encyclopedia: Raymond Lully
Biobibliographical article on Ramon Lull, who is called "Doctor Illuminatus."
www.newadvent.org
Lull may have been the first to use a mechanical device to generate logical proofs, an early logic machine of his own invention.
www.maxmon.com
MacTutor History of Mathematics: Ramon Llull
Biography, major works, importance in mathematics.
www-groups.dcs.st-and.ac.uk
Illustrated biographical essay. Includes short bibliography.
www-mat.upc.es
Description of a book in the collection of Dartmouth College, very brief biography of Lull, and a painted portrait.
www.dartmouth.edu
Columbia Encyclopedia: Lull, Ramón
Short biographical entry.
www.bartleby.com
The Birth of the Machine: Raymundus Lullus and His Invention
Synopsis of an address by Werner Künzel, in which he discusses Lullus's logic machine, its use and abuse by Athanasius Kircher, and its influence on Gottfried Wilhelm Leibniz.
www.c3.hu
A historical timeline of his life.
www.ralph-abraham.org
The Stoning of Philosopher Raymond Lull
Anonymous 15th-century Spanish depiction of Lull's martyrdom.
worldart.sjsu.edu
Raymund Lull, First Missionary to the Moslems
Full text of biographical book by Samuel M. Zwemer. Each chapter in its own file. Also available for download as a zip file.
answering-islam.org
Short biography, illustrated by early 16th-century woodcuts.
clendening.kumc.edu
The Natural Rhetoric of Ramon Llull
Article on Llull's concept of rhetoric, by Mark D. Johnston.
www.luc.edu
The Ecole Glossary: Ramon Llull
Biography of the Catalan mystic and missionary, by Karen Rae Keck.
www2.evansville.edu
The cover art for John Sowa's book is Ramon Lull's tree of nature and logic. It is reproduced here, along with Sowa's explanation.
www.jfsowa.com
Hebraica Veritas?: Ramón Llull
Two illustrations from an 18th-century edition of his works, linked to a short biography.
www.library.upenn.edu