alswa [OE]
as [MI]
https://www.etymonline.com/word/as#etymonline_v_17910
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED22294
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED2397
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED2398
https://bosworthtoller.com/1517