Question: Who is Helena Lekapene's mother-in-law?
Sentence (from "Helena Lekapene"): Helena Lekapene (in Greek: Ἑλένη Λεκαπηνή; Latinized to Lecapena) (c. 910 – 19 September 961) was the empress consort of Constantine VII, known to have acted as his political adviser and "de facto" co-regent.
Relevant evidence: Yes