BAGHDAD (AP) — The new patriarch of one of the most important Christian churches in the Middle East assumed his duties Friday in the Iraqi capital weeks after he was elected for the post. Polis III Nona, who was born Amel Shamoon Nona, 58, replaced Cardinal Louis Sako of the Chaldean Catholic Church, who stepped down in March saying he had asked to retire to pursue “prayer, writing and simple service.” The new patriarch previously served as the Archbishop of the northern Iraqi city of Mosul and