Pope Celadion (Keladionus) was the 9th Pope and Patriarch of Alexandria. He reigned from the year 152 to 166 AD.

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Celadion was born in Alexandria, Egypt. He was elected Patriarch in the year 152 AD during the reign of Antoninus Pius.

When he took over the leadership he tended to the duties left to him by his predecessors.

He reigned for fourteen years, six months, and three days, and died during the reign of Marcus Aurelius and Lucius Verus, on the 9th of Epip (16 July), in the year 166 AD.^[1]