Who married Euphrosyne Kastamonitissa?

Euphrosyne Kastamonitissa (Greek: Εύφροσύνη Κασταμονίτισσα) was a Byzantine noblewoman of the Kastamonites family, a wife of Andronikos Doukas Angelos (a cousin of the ruling Komnenos dynasty) and mother of the two future Byzantine emperors from the Angelos family: Isaac II Angelos and Alexios III Angelos.

Andronikos Angelos Doukas (Greek: Ἀνδρόνικος Ἄγγελος Δούκας; c. 1133 – before 1185) was a Byzantine aristocrat related to the ruling Komnenos dynasty. During the reign of his cousin, Manuel I Komnenos, he served without success as a military commander against the Seljuk Turks, and as envoy to the Kingdom of Jerusalem. Following Manuel's death, in 1182, he was sent to stop the rebellion of Andronikos I Komnenos but was defeated and eventually defected to him. Shortly after, he led a failed conspiracy of leading aristocrats against Andronikos I. When it was discovered, Andronikos and his sons fled the Empire, ending up in Acre, where he died. He was the father of emperors Isaac II Angelos and Alexios III Angelos.