1193?-1280 1225?-1274 1946- 231 albertus angels approximately335-approximately394 approximately580-662 bt98 christianity confessor earlychurch earlyworksto1800 god god(christianity) gregory history historyofdoctrines jean-luc knowableness marion maximus mysticalunion mysticism negativetheology neoplatonism phenomenologicaltheology philosophy saint theareopagite thomas to1500