Arsenios Autoreianos
| Saint Arsenius of Constantinople | |
|---|---|
| Ecumenical Patriarch of Constantinople | |
| Church | Church of Constantinople | 
| In office | November 1254 – February/March 1260 March/June 1261 – May/June 1264 | 
| Predecessor | Manuel II of Constantinople Nicephorus II of Constantinople | 
| Successor | Nicephorus II of Constantinople Germanus III of Constantinople | 
| Personal details | |
| Born | Arsenius Autorianus c. 1200 | 
| Died | 30 September 1273 | 
| Denomination | Eastern Orthodoxy | 
Arsenius of Constantinople (Latinised as Arsenius Autorianus; Greek: Ἀρσένιος Αὐτωρειανός; c. 1200 – 30 September 1273), Ecumenical Patriarch of Constantinople, lived about the middle of the 13th century.
Born in Constantinople c. 1200, Arsenius received his education in Nicaea at a monastery of which he later became the abbot, though not in orders. Subsequently, he gave himself up to a life of solitary asceticism in a Bithynian monastery and is said to have remained some time in a monastery on Mount Athos.