Basil I
Nicholas Adontz in his book "The age and origins of the emperor Basil I" (1933) expressed a theory that Leo V and Theodosia were ancestors of Basil I. The theory was partly based on the account of his ancestry given by Constantine VII, a grandson of Basil I, as well as the accounts given by Theophanes Continuatus. Basil I, according to these accounts, was a son of peasants. His mother is named by Constantine VII as "Pankalo". The name of his father was not recorded, but the names Symbatios and Constantine have been suggested; both were names used by the eldest sons of Basil, with eldest sons of Byzantines typically named after their grandfathers. The paternal grandfather of Basil is named as Maiactes. The paternal grandmother was not named but was identified as a daughter of "Leo", a citizen of Constantinople. Adontz identified this Leo as Leo V, which would make Leo V and Theodosia great-grandparents of Basil I. Adontz also suggested Constantine VII had made a mistake in the generations separating Maiactes and Basil. This suggests that Basil was a great-grandson of Maiactes and not old enough to have seen the wars with Krum of Bulgaria, which would make Leo V and Theodosia fourth-generation ancestors of Basil.