I had not known that King Alfred of Wessex was a saint; I did know him as the guy who rightly gets credit for preventing a complete Danish conquest of England though is sometimes wrongly believed to have united all England under his rule. Like any epic hero, he was down and out for a spell, hiding in the bushes and being chastised by angry housefraus who didn't like their cakes burning on the hearth, but struggled back and won a smashing victory. Having defeated the invaders, he forced them to take baptism. While I find this theologically suspect, I can understand why it warranted canonization.
For my own part, I am far more impressed that he translated Boethius' Consolation of Philosophy, Gregory's Pastoral Rule, Bede's Ecclesiastical History, and Gregory's Dialogues. I suppose it should count as one of his miracles that he was a fierce and successful warrior who was also a scholar and translator. If so, maybe he does deserve sainthood.