Page "Constantius II" Paragraph 20

Once there, he decided to first call Ursicinus, Gallus ’ magister equitum, to Mediolanum for reasons that remain unclear.

Constantius then requested the presence of Gallus and Constantina.

Although at first Gallus and Constantina complied with the order, when Constantina died in Bithynia, Gallus began to hesitate.

However, after some convincing by one of Constantius ’ agents, Gallus continued his journey west, passing through Constantinople and Thrace to Poetovio ( Ptuj ) in Pannonia.