The Emperor Constantius ejects Paul after his Election to the Bishopric, and sending for Eusebius of Nicomedia, invests him with the Bishopric of Constantinople
Not long afterwards the emperor having arrived at Constantinople was highly incensed at the consecration [of Paul]; and having convened an assembly of bishops of Arian sentiments, he divested Paul of his dignity, and translating Eusebius from the see of Nicomedia, he appointed him bishop of Constantinople. Having done this the emperor proceeded to Antioch.
Source: Ecclesiastical History (New Advent)