Ancient Perspectives on Mary’s Descent from David

Are there any early or ancient sources suggesting Mary was descended from David? I found an argument in Tertullian’s *Against Marcion, Book III* indicating that Christ’s descent from the “seed” (Rom. 1:3; 2 Tim. 2:8) and “bowels” (2 Sam. 7:12) of David could only be fulfilled through Mary. Moreover, because Joseph was descended from Jechoniah—whom God cursed so that none of his “seed” would prosper on David’s throne (Jer. 22:30)—Jesus could not be regarded as the “seed” of David through Joseph. I have also come across arguments suggesting Mary might have been of Aaron’s lineage. First, Elizabeth, who was married to a Levite, is explicitly mentioned as Mary’s close relative (Luke 1:36). Second, there is the promise of an “everlasting priesthood” from the seed of Phinehas (Num. 25:13). I’m somewhat confused by these claims and would appreciate any links or references to authoritative or early sources that discuss these points. Later Addition: I have also found that some early writers took a reading of Num. 36:6–7 that implied all inter-tribal marriage was to be prohibited. From what I have been able to track down, this was proposed by St. John of Damascus in *Exposition of the Orthodox Faith (De Fide Orth.), Book IV, ch. 14* and later cited by Aquinas in the *Summa Theologica III, question 31, article 3*