But sometime after, a considerable war broke out in the city, and Origenes departed from Alexandria. And thinking that it would be unsafe for him to remain in Egypt, he went to Palestine and abode in Caesarea ... But Demetrius sent for him by letter, and urged him through members and deacons of the church to return to Alexandria. So he returned and resumed his accustomed duties. Eusebius of Caesarea, Historia Ecclesiastica 6,19,16 and 19.
C. 215/216 AD. Translation P. Schaff - H. Wace.
Thus, arriving in Alexandria, Caracalla ordered the destruction of the symbol of the city and a large crowd, following a riot provoked by the people; bloodthirsty, he never did anything commendable. Georgios Synkellos, Ecloga Chronographica, Corpus Scriptorum Historiae Byzantinae I p. 672.
Translation Chris Rodriguez.
Antoninus had a multitude of Alexandrian entrepreneurs put to death, and he wrote to the Senate that it did not matter how many of them or who was dead, for all deserved it. Petrus Patricius, Excerptum Vaticanum 149. Not in the Loeb edition, but it is Dio 77,22,3.
Translation Chris Rodriguez.