Irene Komnene Palaiologina dating history

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Irene Komnene Palaiologina (Greek: Εἰρήνη Κομνηνή Παλαιολογίνα, romanized: Eirēnē Komnēne Palaiologína; c. 1218–1284), after c. 1261 known by her monastic name as Eulogia (Εὐλογία), was an elder sister of the Byzantine emperor Michael VIII Palaiologos. Originally close to the emperor, her opposition to the Union of the Churches in 1273 led to their estrangement, and even to intrigues by Irene against Michael involving foreign rulers. As a result, she was imprisoned for the remainder of his reign. After Michael's death, she encouraged Andronikos II Palaiologos to repudiate the Union.