After the battle of Kadisiya (Qadisiya) Ctesiphon and the neighbouring towns were taken and plundered by the Arabs in 6 3 7, who brought home an immense amount of booty (see CALIPHATE).
The same process of decay was greatly promoted by the Arab conquest of Persia, achieved through the victory of Kadisiya in 636-637.
Meanwhile the war was also carried on against the Persians in Irak, unsuccessfully at first, until the tide turned at the battle of Kadisiya (Kadessia, Qadisiya) (end of 637).
After several encounters there ensued (637) the battle of Kadisiya (Qadisiya, Cadesia), fought on one of the Euphrates canals, where the fate of the Sassanian Empire was decided.
The field of Kadisiya lald Ctesiphon, with all its treasures, at the mercy of the victor.
At the battles of Kadisiya (Kadessia) (637) and Nehavend (641):