regarder [OF]
regarden [MI]
to regard [ME]
regardiŋ
https://www.etymonline.com/word/regard#etymonline_v_43930
https://www.merriam-webster.com/dictionary/regarding
https://quod.lib.umich.edu/m/middle-english-dictionary/dictionary/MED36474
https://anglo-norman.net/entry/regarder