Mosque, which was constructed with a portico for shade, and ornamented with marble pillars from the palaces at Hîra.[305] Another square was left clear for the market; and to every man was allotted ground proportioned to the number of his household. Sád built for himself a spacious edifice, with materials carried from the royal buildings at Hîra, and he reared in front of it a gateway to prevent intrusion from the market-place, which was hard by. The rumour of ‘the Castle of Sád’ troubled the simple-minded Caliph, and he sent Mohammed ibn Maslama with a rescript commanding that the gateway should be pulled down. Arrived at Kûfa, the envoy was invited by Sád to enter his mansion as a guest, but he declined. Sád therefore came forth, and received the letter at his hands, which ran thus:--‘It hath been reported to me that thou hast builded for thyself a palace, and people call it _The Castle of Sád_; moreover, that thou hast reared a gateway betwixt thee and the people. It is not thy castle; rather is it the castle of perdition. Whatsoever is needful to secure the treasury, that thou mayest guard and lock; but the gateway which shutteth out the people from thee, that thou shalt break down.’ Sád obeyed the order; but he protested that his object in building the portal had been falsely reported, and Omar accepted the excuse. [Sidenote: Irâc settled with the _Felaheen_. The SAWÂD.] The settlement of the land was the next concern. The SAWÂD, or rich plain of Chaldæa, having been taken, with some few exceptions, by force of arms, was claimed by the Arab soldiery as prize of war. The judgment and equity of Omar is conspicuous in the abatement of this demand. After counsel held with his advisers at Medîna, the Caliph ordered that cultivators who had fled during the operations in Irâc from fear, as well as those who had kept to their homes throughout, should be treated as _Zimmies_, or protected subjects, and confirmed in their holdings on payment of a moderate tribute. The royal forests and domains, the lands of the nobles, and of those who had opposed the Moslem arms, and also endowments of the Fire-temples, were all confiscated; but the demand for their division as ordinary prize was denied. Equitable distribution was impossible, and the attempt would but breed bad blood amongst the people. The necessities also of the great system of canals, and of the postal and other services, as a first charge upon the revenues, demanded that the public lands should be kept intact. Such were the ostensible reasons. But a profounder cause underlay the order. Omar would maintain the martial spirit of his followers at any cost, and render it perpetual. With him it was of first necessity that the Arabs should not settle anywhere but in camp, or other place of arms, nor engage at all in husbandry, lest they became fixed to the soil, and so the spirit militant decline. The people of Arabia must in every land be men of arms, ready at a