W.H.Turton gives a speculative ancestry from Leofric I, Earl of Leicester, presumed g3grandfather of Leofwine - "The
Plantagenet Ancestry" (Balt.:Gen.Pub.Co.,1968), p. 130. Leofwine was known as earldorman of the Hwiccas and in 1017
was Earl of Mercia. Another proposed ancestry shows Leofwine as son of Elfwina of Mercia (daughter of Edward I the
Elder [ID1631] and Edgiva) and Edolf or Edulph (of Saxony?).

References: [AR7]