Hi:
Don't know if this helps any but from the Maryland Archives online, *Col. HENRY SEWALL of St. Mary's County (Cath.), com. by Lord Baltimore as Principal Secretary and Judge of Probate, 20 Aug. and sworn 20 Nov. 1661. After his death in office,April, 1665, Col. Sewali's widow, who was a cousin of Mrs. Philip Calvert, married the Hon. Charles Calvert, later third Lord Baltimore and Proprietary Governor of Maryland. I believe his last name was Sewall as opposed to Sewell. Perhaps using that spelling will yeild some more info.
Henry and his wife, Jane Lowe are my 11 X Great grandparents. I'm still researching Henry's parents.
Barb