Louis Marie Olivier Duchesne, 1911 Encyclopædia Britannica, Volume 16… (1911)
“ At the end of an exile of more than two years he yielded so far as to subscribe a formula giving up the “homoousios,” to abandon Athanasius, and to accept the communion of his adversaries—a serious mistake, with which he has justly been reproached. This submission led the emperor to recall him from exile; but, as the Roman see was officially occupied by Felix, a year passed before Liberius was sent to Rome. It was the emperor’s intention that Liberius should govern the Church jointly with Felix, but on the arrival of Liberius, Felix was expelled by the Roman people. ”
