Cyril of Alexandria n (Biography) Saint. ?375?444 ad, Christian theologian and patriarch of Alexandria. Feast day: June 27 or June 9 Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014