- The first  decade of his reign (Constantine IV) was marked by a reversal in the history of Christianity: for the first time, the Crescent armies were repulsed and put to flight by those of the Cross. This brief respite did not last. Since Caliph Ali had been assassinated in 661, Muawiya reigned supreme; he had established his capital at Damascus and founded the Umayyad dynasty, which was to last eighty years. Now that his resources were immensely increased, he resumed his old tactics (in the time of the Otman caliphate, Muawiya was already leading the Muslim troops, and among other things, he had taken Cyprus by giving the Muslim army in particular naval force it did not possess before): its army in Anatolia and its fleet along the Ionian coast pillaged imperial cities and islands one by one. Finally, in 672, his ships entered the Sea of Marmara, where he took the peninsula Cyzique, eighty kilometers from Constantinople. Two years later began the siege.
His successor Yazid 1st (680-683) will confront him. Thinking to invest the city of Kufa, Husayn is taken speed by Yazid 1st, whose envoys first execute the emissaries of Husayn and then meet Husayn en route to Kufa and decimate his troops in Kerbela. Husayn himself being killed and his body broken in pieces, thus fueling Islam’s dissensions for many centuries: Husayn was the son of Ali, the first male believer, cousin of the Prophet, and grandson of the prophet, son of Fatima , daughter of the prophet.
(extract of the psalm 81 associated to this generation, verses 1 to 8 )
- For the conductor, on the gittith, of Asaph.
- Sing praises to the God Who is our might, sound the shofar to the God of Jacob.
- Raise [your voice in] song and give forth [with] a timbrel, a pleasant harp with a lyre.
- Sound the shofar on the New Moon, on the appointed time for the day of our festival.
- For it is a statute for Israel, the judgment of the God of Jacob.
- As a testimony for Jehoseph, He ordained it, when he went forth over the land of Egypt, [when] I understood a language that I had not known.
- I removed his shoulder from burdens; his hands were removed from the cauldron.
- In distress, you called and I released you; I answered you-[though you called] in
- In distress, you called and I released you; I answered you-[though you called] in secret- with thunder; I tried you by the waters of Meribah, forever.
(extract of the psalm 81 associated to this generation, verses 9 to 17 )
- Hearken, My people, and I shall admonish you, Israel, if you hearken to Me.
- No strange god shall be within you, neither shall you prostrate yourself to a foreign god.
- I am the Lord, your God, Who brought you up from the land of Egypt; open your mouth wide, and I shall fill it.
- But My people did not hearken to My voice, neither did Israel desire to [follow] Me.
- So I let them go after their heart’s fantasies; let them go in their counsels.
- If only My people would hearken to Me, if Israel would go in My ways.
- In a short time I would subdue their enemies and upon their enemies I would return My hand.
- The enemies of the Lord would lie to Him, and their time would be forever.
- Then He would feed them with the fat of wheat and I would sate you with honey from a rock.
 John Julius Norwich: « History of Byzantium ». Chapter 8: « The Line of Heraclius » (French: « Histoire de Byzance ». Chapitre 8 : « La lignée d’Héraclius » (p. 124/125) ).
 Voir DEUTERONOME Chapitre 9, versets 6 à 29 (déjà reproduit)