Asín points to the impact of these Muslim and Jewish thinkers of Spain regarding medieval Christian theology, for example, the long drawn-out struggle between the Aristotilean ideas of Thomas Aquinas (1225–1274) and those of Duns Scotus (1266–1308). Asín's dogged research, on the persistent influence of Ibn Masarra's school of mystical philosophy, leads him to follow its tracks eventually to Ibn 'Arabi (1165–1240), as well as to Ramon Lull (1233–1315) and to Roger Bacon (c. 1214-c. 1294). Later another scholar would find evidence that may link the school of Ibn Masarra to the philosopher of light ["al-Ishraq" and mystic of Iran, Suhrawardi (c. 1155-1191). Asín's 1914 "Abenmasarra y su escuela" established a lasting influence on subsequent scholarship.