Question: Who is the father-in-law of Beatrice Of Sicily, Latin Empress?
Sentence (from "Philip I, Latin Emperor"): Philip, also Philip of Courtenay (1243 – 15 December 1283), held the title of Latin Emperor of Constantinople from 1273–1283, although Constantinople had been reinstated since 1261 AD to the Byzantine Empire; he lived in exile and only held authority over Crusader States in Greece.
Relevant evidence: No